How To Revive Dead Scooter Lithium-Ion Battery - (Or Any Device!)

[@TechEyeMan]

Hey Guys I’ve added time stamps to the video to help skip to the key parts but i’d recommend watching all to get a good idea of what to do.

[@curtisslinkard8390]

Need to skip to at least 9 minutes to get where actually jumping the battery. Everything before is just rambling.

[@seanward5211]

I do not condone violence of any sort! However, I wanted to punch him through the screen

[@tyreakerenzy7341]

Glooks

[@roxasparks]

Das itch true

[@ChaosMayhem-ck5qw]

Thx

[@svthorasailing4868]

Not all heroes wear capes.

[@traditionrider]

Best video I’ve seen on this subject. Thank you

[@TechEyeMan]

Thanks! I'm glad you found it helpful.

[@f11r25]

Do you need a special tool to charge or can you use the original charger

[@sufytech7243]

thanks a lot, it worked for me, i just put a cable direct from the charger to the batery and left it charge for 30 min and then it let me charge it normal through the bms

[@joserodriguez-wm3bm]

can i use the charger from thescooter 42 volts to jump charge

[@eminsljivar6071]

What if i dont have that machine that gives it volt. Can i use something else?

[@poison335_]

What do i do if minus and plus are going straight to the port and not in the bms? Only one wire is going in the bms should i disconnect that?

[@VacuumTube88]

Thanks I didn't know about the secret Allen screws for removing the steering tube, I got a different problem, battery charges only up to half, but it was usefull for inquiring the problem.

[@HARRYRUSHAKOFFBONGOLOID]

What I don't understand is since you say you can do this with any battery but everybody else might have a different scooter why would you spend so much time on showing people how to take apart the scooter that you have when you just said everybody probably has a different one but has the same battery type why wouldn't you just get to the battery issue?

[@gamerzzharfa8394]

Hi..may i know what model or brand your scooter?

[@theodoreking8605]

seems to have worked with one I picked up on marketplace. Was a bit difficult to put the top back on and ended up stripping some of the screws. To be honnest im not a fan of the upper portion. Perhaps I could 3dprint a new control bar to make the electronics a bit more accessible

[@TechEyeMan]

Yes they can be a bit tricky to take apart. and if your going to be wanting access to the battery/electronics often then it might pay to 3D print another section

[@rustmonkey2948]

​@TechEyeMan My sons scooter was left uncharged for a while. So no longer accepting any charge. Tried going directly to the lead that goes to the motor. It doesn't draw and amps. Any ideas?

[@KingShit3336]

Wouldn't it work to use the original charger by plugging it in directly to the battery with bypassing the BMS..?

[@TechEyeMan]

it could work depending on the chargers. most chargers won’t give current if the voltage is too low.

[@KingShit3336]

@@TechEyeMan I actually tried it last night using the original charger and some wire leads since the battery and the charger have the same plug.. It did work as far as my charger recognizing that the battery was there and starting the charging cycle.. prior to this, the light stayed green and the charger wouldn't turn on when I had it connected to the charging port..

[@colebaer9439]

Hey TechEyeMan, I have the same scooter and same problem because I bought it from a friend who had not used it for a very long time but I do not have the variable power supply. I have a drill battery that puts out 14 volts at 1.5 amps or a lawn mower battery that puts out 40 volts at 6 amps. My scooter is only supposed to have 29.4 volts at 2 amps, which one should I use or what should I do? Btw I have already tested my charger and it works fine. Thanks, great video

[@jetonbajrusi7794]

Hey bro would you know what brand the scooter is and how o can find the information to it

[@espoirahadjitse4255]

Hi which charger will you recommend for that scooter?

[@kuntz144]

Do you know anything about the bird 3 scooter battery. How to revive the battery

[@ahsanmahmood3378]

Hi, One more thing i want to ask. When i driven the scooter its battery goes down 29 to 22 volt and sudden its shut down. I guess as you told the bms shut down it when its reach to 19 volt. In this case when its shut down what do u advice. Pls

[@wahlmanangelita87]

hey where i can buy the online of Eyu battery ?

[@AnthonyXXIV]

Do you have part numbers for the controller and battery?

[@josepenate8600]

Hey friend, notice that I bought a similar scooter, but without a charger and I would like to know how many volts, can I buy the charger?

[@rustmonkey2948]

​@TechEyeMan My sons scooter was left uncharged for a while. So no longer accepting any charge. Tried going directly to the lead that goes to the motor. It doesn't draw and amps. Any ideas?

[@TechEyeMan]

do you mean you went directly to the lead going to the battery? or you tried spinning the motor? these kind of scooters have brushless motors that require a motor controller and have 3 leads. unless it’s an older scooter with a standard 2 lead dc brushed motor.

[@jozeflipka]

Hi. What is that unconnected green wire?

[@Tkdmaster1991]

So when doing this, is it important to have a variable power supply that can match the output voltage of the charger? I have a scooter that takes a 64.4V charge, so most fo the normal vairables I see are only 2-24V

[@TechEyeMan]

Yep that’s right, the higher voltages can be tricky. you could try using the charger directly via some wires but the charges usually don’t charge unless they detect the battery/bms. otherwise you might have to get into the battery to the cells and charge the groups of cells individually.

[@chicagotrucker1273]

My battery is only charging up to 3 bars. Can I do this method?

[@junioroliver6084]

Hello. Thanks for the vid. I have the same scooter and issue. To ask, could you explain briefly how I would use a drill charger (mine is 24V) in place of the variable power supply you use? Many thanks.

[@TechEyeMan]

if the drill charger is the same voltage then it may work but depending on the drill charger, it may have some electronics in it that communicates with the drill battery to get some more info such as temperature before it starts charging so it might not be possible to bypass. You could however use the drill battery itself to try jumping your dead battery by using some paper clips or similar thick wire to make contact between the positive and negative of the drill battery (they are usually the 2 outermost contacts) and then connect them to the positive and negative of the scooter battery like in the video, but i would be careful again of the current because there is no limit on how much it will take so make sure you monitor the temperature and keep an eye out for anything unusual.

[@LoganTanner]

Whatever you're fixing there is EXACTLY the Hover-1 scooter I'm struggling with. Charger stays green, so I bought a new charger. Still wont charge. Jumped the batter off a DC power supply at 29.4v 1.5a and now it turns on, but battery STILL doesn't charge off charger (green light doesn't go red). What's the next step? Barrel connector? BMS problem?

[@TechEyeMan]

if you have a multimeter, check the voltage at the battery terminal (before the bms) to make sure it holds charge and stays there. if the voltage drops after a few hours then one or more cells may be bad, if the battery holds charge then likely it’s a bad BMS

[@LoganTanner]

@@TechEyeMan Thank you for the fast reply! Subbed as a thank you. Ok, so what I discovered after pulling the whole battery out is that the negative wire that comes off what I believe is the charger connector (not the XT30 power cable) is not connected to anything. Like it broke or got cut in the tube. It looks like there is a spot on the PCB board that it may have broken off from, so I'm going to jumper that and test today. If it works, then I solder it on and put it all back together. Thanks!

[@TechEyeMan]

@@LoganTanner yes the negative wire from the charge port should solder into the bms. it’s usually marked with a little “-“ for negative. try stripping the wire back and touching it on that negative solder pad while plugged (charging) to see if it starts charging normally, then you can resolder it

[@isaacogedegbe5557]

@TechEyeMan Hello sir, trust you are doing great, I use an Hover 1 alpha E scooter, so two days ago I was changing the accelerator of my scooter but in the process of assembling it together i found out that the beep device was loose but before I could touch it , it mistakenly touched one point of the display panel which resulted in some weird noise, and the scooter tripped off and wouldn't come on again.... Pls do you have any idea what I could do to resolve the issue...

[@TechEyeMan]

Hi Isaac, sorry to hear about that. Hard to say exactly what happened but i’m going to assume you shorted out the display. there’s typically no protection such as a fuse for these so your best bet is to replace it and be careful when reinstalling it. it’s worth noting that sometimes if the brake lever is pressed or being triggered it could stop it from powering on(as you were working on the accelerator), so worth checking that too. i’m not familiar with that scooter but have a look around if there are any fuses that can be replaced and then the next step would be to replace the display.

[@isaacogedegbe5557]

@@TechEyeMan Wow 😊 so glad you replied really grateful and thanks for the tip.. Thought the fault was from the controller course I perceived something burnt on the board... Thanks 🙏 :>)

[@Tariq-z9l]

We're can I find the reset button on choux 1600

[@KashifKhan-qu8lh]

I have a PEDLR PRO PM Escooter and the battery is same as this, inside the stem (round batteries). I need a replacement battery for it. Can you recommend any places where I can purchase it please

[@EdSpooky]

Do you think it would work on a completely discharged battery that discharged due to water? i was riding on the rain and my battery got wet. all works except the battery. :(

[@TechEyeMan]

water can be a hard one. it can fry the battery electronic (bms) which is probably what happened. you’ll have to open it up and let that water dry up and see what it’s damaged

[@fr33sat56]

Visualy i have same scooter. Dont know model, but buyed in Hofer/Aldi. Last year i fix battery with this tutorial, Few days ago i tried again. Battery start charging from 17V to 22V then stoped. I take parts out and first i smell something burn in controller (aluimium case with wires). Then i take out battery and fell some smell. Inside baterry i believe it is BMS with DLX-9010B sign. I still have to take all battery apart and measure it one by one. My question is, where can i buy right controler and BMS for this scooter. Charger is 29,4 V. I found something on aliexpress, bit i dont know do i need controler for 24V or 36V ?

[@CeQuana]

What voltage would I need the power supply to be at to jump a 52 battery?

[@TechEyeMan]

52v would be a 14s pack which would need to be charged to 58.8 volts, which is a bit high for most power supplies. you might have to charge the individual cells or the series of cells up inside the pack, that or find a battery or put some batteries in series so you can get to that higher voltage.

[@CeQuana]

@@TechEyeMan Thanks for the info, was as I suspected but wanted to be sure. Managed to get a 60v unit and got my battery back up to voltage for the charger to be recognised. Great video helped me a lot!

[@benassy69]

Hello. I have the exact same scooter but do not have the original charger. I used a generic 24v charger but the battery charges only 3 bars. Can you please let me know the nominal voltage of the charger ? Thanks!

[@TechEyeMan]

hi mate, the charger will need to get up to 29.4 v

[@ademiravdic]

my scooter started shutting off when battery gets just below 50%, any ideas whats wrong with battery? It chargers properly after, but once it cuts off wont turn on without charging first.

[@grizeldiaz9558]

Hi, I have a Momas S4 and the battery was empty, I charged but it doesn't turn on, happened once and the suddenly worked, but not this time! What can I do?

[@vikassinghrana5929]

Hey brother nice vedio..... Can you help me with my range battery of my scooter ....its showing correct voltage but still doesn't run

[@stevekirn8017]

So if I’m jumping a 60v escooter battery pack for example I would need to use a variable power pack that has more than 60Volts?? I’m just a little confused as to what voltage I need the variable power supply to be at to jump these few sleeping 60v escooter batteries I have. Thank you I’m advance for any help!!

[@TechEyeMan]

hi steve, that’s correct, you need to jump it with a higher voltage than the battery pack, if you can’t get that high a power supply(which is hard) you could use several smaller batteries in series but if all else fails you will have to disassemble the back and charge the cells directly, each cell (or group of cells on parallel) will need to be charged to 4.2 volts.

[@stevekirn8017]

@@TechEyeMan thanks appreciate your response. I ordered a high voltage variable power supply so ill try using that I guess at around 72V for the sleeping 60V battery packs & see how that goes. Your video was a great help in understanding how to wake these things up.

[@myunghong9004]

The XT 30 terminal you explained is that cable the actual output cable from the battery or charging input battery cable connected to BMI. Should you issolate the cable positive cable when charging from your boost power supply( will the BMI be damaged)

[@imanel-gadaa7020]

Hi, Myung. The answer is they are the same cable. the bms runs the negative cable from the battery, through the bms then out to the load and the same for charging. remember that the bms job is to balance the battery in both charging and discharging. what we are wanting to do is bypass the bms and charge straight from the battery output. but in some cases it’s the charger and not the bms that detects the low voltage, in that case you can jump charge it after the bms.

[@jeffherring9945]

⁹⁹⁹9

[@brobeckskazooremixes8703]

Would it be possible at all to somehow use the original charger and somehow do what you did in the video but without the power supply? How would I do this, if it is possible? Would I have to take apart the charger or is there a way I can clip onto it somehow? I look forward to your response

[@TechEyeMan]

Hi, it’s an interesting question, it depends on the charger. Most chargers don’t allow current to pass unless there’s some feedback from the battery. If you could hook up a wire to the positive and negative of the charger and do the same bms bypass it could work, but if it doesn’t then the charger isn’t letting current through, it would need to be tricked using a resistor value but i haven’t tried this.

[@phantomroadster]

Someone on another video used an automotive bulb to trick it ​@TechEyeMan

[@chrisc6342]

Hey my scooter turns on and charges but won’t run how can i fix it its the same one you showed in the video

[@TechEyeMan]

does the scooter turn on? could be the controller

[@chrisc6342]

@@TechEyeMan yes it turns on just went you hit the gas i doesn’t run

[@imanel-gadaa7020]

ok if it turns on and it shows full battery it could be the throttle. but i think they sell the display and the throttle together

[@陈豪劲]

I have an electric scooter like you, the battery can not be charged, and the green light is always displayed. How many V of mobile power supply do you use to charge the battery of the scooter, and how many amps of current do you use to charge it, and how long will it take to be fully charged?

[@TechEyeMan]

the V or voltage will depend on your battery but it should say the output voltage on the charger. As for the current, most of these power supplies have a max current draw of 10 amps which they will be limited to which is fine. but once it starts charging the current will drop down to a few amps.

[@apefapperpro5946]

What's that charger called

[@georgekashuba1656]

Need to see how to remove barriers from bullet stealth axl model

[@lelandschmidiii590]

What kind of charger are you using ? Where can I get one ? And how much do they cost ? Thank you just let me out tremendously I'm sure I have a eyezip e3 ultra electric bike that I need to do it it's battery I would love to ride it.

[@TechEyeMan]

just look for a 29.4v lithium battery charger from ebay. if your talking about the power supply, they are a bit more expensive but it’s a variable dc power supply

[@titanzyt8734]

What's the name of this scooter?! I have the same " S8" but can not any reference on the net.

[@XdHorcica]

I have thees scooter but i dont know full name i need akcelerator predal plesa send me it❤

[@zore9297]

Dude how to fix voltage drop mine is 55.2 when full charge but it drop to 50v

[@williamrosero4697]

I have scooter hiboy S2pro i do not charger. Where can buy charger?

[@moonbow6913]

What is the brand and model of this scooter?

[@makycaris4672]

If u have a scooter and not used for a while can the battery be damaged if never charged or fall below the level to charge

[@TechEyeMan]

hi Maky, yes it will slowly drop on voltage until its too low for the charger to charge

[@makycaris4672]

Even if you bought out of the box store and never charged it for a while year or so / omg that’s why they sell all these scooters 50% off they may be junk

[@dl5733]

Great video. To charge mine i have to have it on and the light on. The voltage was 22.4 when i started charging now 24.7 the bms is blinking red 4 fast then blinking all the time. What can be wrong ?

[@r26ff47]

My blink red 4 times too. Bms output 18.5v, but the pack output 36v. Is yours fix?

[@jkucukov]

I revived my battery pack using your method, however what im finding when hooked up to the regular charger is the battery pack in the center is getting hot to the touch

[@TechEyeMan]

That could mean that one of the cells are dead or on its way out. i would recommend changing that cell. if you charge it and leave it overnight and the voltage drops significantly then it’s clear you have a bad cell.

[@jkucukov]

@@TechEyeMan I removed the battery from the GoTrax scooter and connected it back to the power supply that I used to jump start the pack. At least on the power supply its slow charging and the battery pack does not get hot, currently power supply shows its at 18V, its slow moving. I'll leave it on today to see if it'll ever reach 25.2V.

[@quincylockett7846]

It's rained and mine got real wet E4 code 2 day 3rd day cut off on me ..power button unrespons🤷🏿‍♂️?? Swagtron swagger 5

[@Shagwag_adventures]

Amazing video! Please help if possible!! I have a 48v scooter battery, the charging specs are 54.6volts 2amps. I have my PSU set to the charging parameters exactly. The problem is when I connect it to the discharge port like you did, my voltage on the PSU does NOT drop, and my AMPS begin cycling from 0.130 to 0.000 over and over again. Any help would be much appreciated! If I continue to leave it hooked up will it damage anything? When I pull it off and check the battery voltage with a meter it is going up slowly therefore it’s taking a charge. Just not sure why it’s not staying at a constant amp output.

[@TechEyeMan]

Hey there! that’s strange, try to make sure that you can see that the cables you are connecting the charger to are indeed going straight to the battery cells and not through the bms. You should also be able to read a voltage from those wires before you charge and it shouldn’t be too low because the cells should still have some juice. i can’t see why the current would be dropping to zero and back unless it’s not going to the cells directly or there’s a break somewhere in the line. In the worst case scenario you can strip the pack down until you get to each of the cells and charge them directly to 4.2 volts each(some might be in parallel and that’s fine) i wouldn’t leave it unattended because there is no protection agains over charge or over heating if one or more cells are damaged.

[@benalexander9907]

Thanks the On my way! I have is acting strange. It has 3 sets of wires and I need to do this trick. Thanks.

[@lilchunkyboy3787]

I have the same issue with my scooter 1600w), the only difference my charger is red for a few seconds then turns green, even though the scooter is completely drained.

[@tombarrett9120]

Hi did you resolve this problem? I have the same with my scooter

[@gerardkenny8882]

Great video thanks .. Might you know how to wake-up a Unagi E500 e-scooter's 33.6V battery ? I reckon it may be in sleep mode because the owner left discharged and when he gave to me to fix it had dropped to around 20V. I used and external P/S connected directly so as to bypass the LiIon protection circuit and succesfully / carefully charged the BS-18650-8S3P battery back to max 33.6V (nominal 28.8V). However the battery still wont charge via the normal charge port when I use a scooter 33.6V 2A P/S with same connector adaptor and same rating as origional P/S It still wont cahrge even if I use the bench P/S to provide charge via the normal charging port. There's no current flowing ! I dont have the original Unagi P/S as is lost and a replacxement is expensive. The 33.6V battery is a sealed one. I dont have it's protection circuit's electronic diagram to figure out how it works. Unagi refuse to help because owner has lost the proof of ownership reciept paperwork.

[@MrElapid]

If the voltage of cells or cell groups is OK (enough to keep the bms from shutting things down) I'd suspect the charger or bms. My bms for a large battery doesn't appear to be repairable and quite complex, I'd just replace. Same with a charger if the output voltage isn't right. I have this problem now but DON'T want to replace a 700.00 battery if I can help it.

[@MrElapid]

Correction: not quite the same problem, battery dropped below the voltage needed to keep the BMS turned on. Guess my point was Charger: not that expensive, same with BMS. Quality batteries? Expensive as hell.

[@johnnysins9226]

Can i use the original charger to "jump start" my battery?

[@imanel-gadaa7020]

Unfortunately not. Most chargers detect voltage to regulate the charge and will not supply current if the battery is dead.

[@Ch33secakeGaming]

I found a 36v Escooter battery, that is displaying voltage after I charged it, however it won't power anything. Perhaps the current is still to low, if so how can I increase the current?

[@imanel-gadaa7020]

hello. How do you know it’s a 36v battery? does it say it on it? if the battery isn’t delivering any current that’s usually a sign that the BMS (Battery management system) is faulty

[@Ch33secakeGaming]

@@imanel-gadaa7020 Yes, it says its 36v on the battery

[@imanel-gadaa7020]

@@Ch33secakeGaming try opening up the battery pack and run something from the terminals (positive and negative) coming directly from the cells themselves (before the bms which will be a little chip) if you get full current in that condition then it means the bms is bad. don’t do this for long however as it may damage the cells.

[@Ch33secakeGaming]

@@imanel-gadaa7020 Alright

[@stefanopena2310]

Hey bud, great video, I am having issues with my Nanrobot X4 2.0, I stored it over the winter in my basement and I just brought it out to use. I turned it on and the voltage meter went from 52v all the way down to zero. I plugged in the charger and the charger said that it was fully charged. I tried turning it on again and it did the samething, it went from 52v down to zero. Should I try to jump the battery with this method?

[@imanel-gadaa7020]

Hey mate. I would just try to get a reading from the battery first if you can get to it, just to confirm the voltage is low. If it was sitting for a few months then it probably has gone down, but it won’t hurt to check, it might be another issue. If the voltage is indeed low, then yes a jump is needed.

[@miguelcan1998]

My nanrobot rs7 die and I wan to orden de other buth i have to wait 3 mount it’s any web site to get other battery or any recomention

[@caimenace]

Can you do it on a dualtron thunder. I went away for 11 months and come back it won’t accept charge. The charger flashes green and red. Any tips or ideas. It was working fine before I went away ?????

[@TechEyeMan]

you can do it but you will need a power supply that can deliver 60 volts. (unless it’s a thunder 2 that has 72v battery) otherwise you will have to charge every cell individually up to 4.2v.

[@valyncia3961]

Hi! My Gotrax turned off on me recently. I turned it on but it only kept on for 5 seconds then shut off. I plugged in the charger and it flashes red-green-red-green. Is this a battery issue?

[@TechEyeMan]

Hi, yes it does sound like battery. does it charge? you need to check the voltage on the battery first. but it could also be the controller or the display but first check the battery!

[@Abubububu]

Hey man awesome video! Have one exactly like this one. My son the other day broke the scooter, he was cleaning it and when he came to the charger port he said that it made a ”cracking” pop sound (damp/wet cloth). Obviously he shorted the bike… it doesnt work anymore… you mentioned that this bike doesnt have fuses… what could it be? Thankful for any tips/fixes 👍

[@TechEyeMan]

Hey mate, sorry to hear about your sons scooter. So it was fine before he cleaned it? Basically shorting out the charge port will likely short out the BMS(battery management system which is inside the battery) or the controller. If you're lucky maybe your one does have a fuse and you can check if its blown. but if not the controllers are not very expensive, same for the BMS. while you have it open just check you have battery voltage (probably 25v for yours but could be different) going from the battery to the controller, if not then the bms is probably fried, if you have voltage then the controller is probably fried, Have a look at one of my other comments where I sent the link for a controller.

[@Abubububu]

@@TechEyeMan cheers mate 👍 will do

[@Abubububu]

@@TechEyeMan Hi again mate! I opened upp the bike and sure enough no fuse so i recon the bms is fried… If i buy the kit you mentioned, do i need to use the display and the throttle that comes with it or are they compatible? Thanx in advance 👍

[@TechEyeMan]

@@AbubububuHey mate, the bms is inside the battery. not inside the controller. but if it’s the controller that’s faulty, you can use your existing throttle/screen

[@Abubububu]

@@TechEyeMan ok, i thought they were together in the enclosed aluminiumcase/box 🙈. I measured the battery voltage and that seemed fine so its definately the controller then. Thanx for the response mate, have a good one 👍

[@jjk9999]

I have the same model scooter and want to replace the battery. One of the cells is busted and it shuts off at about 6 miles (supposed to go 10-12). Fully charged it and tried it a second time and it stopped at about the same distance as the day before. Someone told me that just replacing that one bad cell won't fix the problem and another will go bust soon. So I think I should replace the whole battery. I'd also like to see if it's possible to increase range or speed just by changing the battery to a different one that's compatible with the controller and motor. Will look at the rest of your channel to see if you've already covered it.

[@EdwardTilley]

What inexpensive power supplies do you recommend?

[@TechEyeMan]

the one i use in this video is a Minleaf NPS3010W 110V/220V from banggood. works well for me and i have no issues with it but i do need to upgrade to a higher voltage one for bigger batteries as this one only goes to 30v

[@EdwardTilley]

@@TechEyeMan I was able to wire a $13 compatible offshore ES1, ES2, etc. charger directly into the battery (with stiff wires) per your instructions. It's charging like a charm as we speak - sans controller. I'll let it go for an hour and see is there enough charge to be recognized by the controller. Ordinarily its a 2 to 3 hour charge. Excited to see this scooter work.

[@TechEyeMan]

Awesome to hear man. Let me know how it goes.

[@EdwardTilley]

@@TechEyeMan It charged ok. After 90-minutes the blue light was on steadily (not blinking) on the battery pack and the scooter showed a 2% charge. I couldn't get a disassembled scooter to charge using its internal drive controller (even though the scooter dash showed no errors). I charged the battery again manually for several hours until the charger just turned itself off (as instructed by the battery management computer BMS in the battery pack). After full charging, the disassembled scooter kept seeing a 2% battery and the scooter would not allow charging. A red light is on - on the controller board but I assume this is a ground fault caused by the scooter screws being unconnected. I'll report back after I put everything together.

[@EdwardTilley]

@@TechEyeMan Is there an option for me to send in my controller, to have all fixes done to it - and to confirm its a good controller at the same time?

[@barrykeane8721]

Great video mate can't wait to try it

[@matteopascale483]

did it work?

[@Northrop-Grumman1991]

Video should be called: How To Set Your House On Fire 🔥 101

[@edifierbass7821]

Its a late reply , I have one like that with different brand, i have b4 a Smach Mars 5' tire that's too small for a rocky road its useless, you can easily feel humps and bumps the tire with Hub motor wears off quickly without a suspension, but if manufacturer chooses a big 8" tire for 26v E scoot it would be more reliable like the Dolphin escooter 26v - 8" tube tire

[@robertrobarge5294]

I've got my battery from one volt all the way to 39 volts. I did the same thing and sooner or later the charger recognized it and it started charging the battery. But the two large main ports that come off of the battery that plug up to the scooter when I put a multimeter on these and even on top of the wires where they come out of the battery there's no power coming out of them. But the battery pack itself shows it has 39 volts in it. I've got connectivity from those two wires one is red one is black. I hope the 20 volt battery directly up to the scooter and the scooter turns on. But the battery pack itself has no voltage coming out of the red and black wire

[@TechEyeMan]

that sounds like a dead bms mate. that’s probably also why it was shorting when you were trying to charge it with the other battery. if the pack itself is charged but there’s no voltage coming out of the main leads then the bms is dead

[@curiousgeorge555]

Does anyone fix dead e bike batteries?

[@what8586]

my 48v ebike battery is reading 1v at the charger input and 44v at the battery output , dont really want to open the battery do you think my 48v solar charge controller could jump charge my battery?

[@TechEyeMan]

i’m assuming you have access to the battery leads if you’re able to read that 44v. if it’s a 48 volt solar charger and it’s outputting more than 48 volts then it should be able to jump it as long as the bms doesn’t inhibit it. give it a shot for max 1 minute at a time (straight on the battery positive and negative) and keep measuring the voltage after each attempt. It should start rising. When it gets to above 48 volts the original charger should work like normal. Otherwise you’ll have to open the battery.

[@what8586]

@@TechEyeMan so i used my solar boost charge controller to the battery input and let it sit till 46v than the charger that came with the battery worked like a charm battery is now full and ready to go

[@TechEyeMan]

@@what8586 Awesome work, happy to hear it.

[@MrElapid]

Sounds reasonable but I wouldn't do this with the 72v 20AH sitting on my workbench. Too dangerous. Will trickle charge independent cell groups with a high impedance charger. Will take awhile but I won't burn the place down. Small battery as shown may be safe but keep it away from flammables and get a bag of sand or a fire extinguisher. Seen some nasty fire damage in the forums.

[@AsiyiChibuike]

Pls how do I revive dead battery with another battery

[@TechEyeMan]

do the same steps in the video but use the other battery as the positive and negative. You still need to bypass the BMS

[@ECHO_0.7]

Can someone help me my scooter won’t charge and is just showing green light saying it’s fully charged but its not

[@TechEyeMan]

you will need at least a multimeter/volt meter. Check the voltage first coming from the charger to make sure the charger is working, next check the voltage on your scooter battery. If its totally dead, it wont allow the charger to charge the batteries and you will have to do the above fix in this video. Could also be a bad controller etc. Tick the easy boxes first.

[@AdriftLegend]

Thank you so much TechEyeMan, your solution here really worked for me!

[@lunathekittybat2225]

Hi so my scooter turned off when I was riding it and it was fully charged do you think it was the battery or the motor? The scooter is a Phaweo FW H85B

[@TechEyeMan]

could be throttle, battery, motor or controller. I'd check voltage on the battery first, also see if it has a fuse inline that has blow.

[@lunathekittybat2225]

@@TechEyeMan yea I will also how do I check the fuse if the motor is in the wheel

[@TechEyeMan]

@@lunathekittybat2225 if it has a fuse it won’t be in the wheel it will be near the battery, but many of them don’t have fuses.

[@murky135]

Bro loves to talk...

[@sammyhabib8386]

Hello TechEyeMan. Thanks for the awesome good explained video! Can I do this with a Li-Ion bicycle battery of 42V that dropped to 2V? I don't have the special charger but I have a laptop charger of 19V. Could this work safely? Thanks, S.

[@TechEyeMan]

Hi Sammy, i would say that it probably will not work if your laptop charger is advanced enough it probably will not allow the dead battery to charge. but you might be lucky and it will charge it however it will only charge it to around 30v which might not be enough for your ebike charger to take over. give it a shot though. another thing is your battery voltage is very low. i suspect it’s totally destroyed the cells by now, unless you are only measuring voltage after the bms and not at the battery terminal itself. see if you can measure the voltage of each individual cell if you can get to them (the will look like big AA batteries.) and each cell should be around 3.7 volts

[@sammyhabib8386]

@@TechEyeMan Little info: My E bike was charged but stored for a long time. Now it seems discharged. I had 2V on the battery, the black and red cables. Unfortunately the battery is completely glued with a kind of black silicon in a aluminium tube case. I think impossible to get to the batteries without damaging. Thanks for the help.

[@UnbelievablyBased]

This method is only good if your battery has dropped slightly below the cutoff. If your 42V battery is at 2V on the output, something is really wrong. When a lithium battery drops too far below the cutoff and you attempt to force recharge, conductive crystals can form inside cells that can form an internal short... very dangerous. Like TechEye said, each cell should be around 3.7 volts. You have several of these in series that add up to 42V, if the assembly is reading 2V, there is a serious malfunction. I would not attempt to charge that.

[@productionapostle1298]

Good video... just skip to almost the end where he actually jumps the battery.. tech heads tend to talk way to much and explain way to much.. but still a good video..

[@kapenakanaiaupuni5816]

Brother next time please stick to topic of jumping the battery and how to do it .thank you

[@djdoolittle1315]

Great info , thx 👍

[@ilovedemfokes]

Start watching at about 10:00.....

[@TheOnndo]

Maybe someone knows where to buy? Motor controller 24V 300w

[@TheOnndo]

I added a motor controller 250w to a 300w motor he drives me to the other side :)

[@Ultimaso6]

I have a similar issue! I left my scooter fully charged around August last year. Today the sun was out so I pulled the scooter out and as expected, completely flat. I plugged in to charge and initially the light stayed green on the charger. I kept trying to turn it on and after about 30min, the scooter managed to turn on and began charging🎉 .. unfortunately that would have been too easy :( Excited af, I left to charge fully and ran downstairs to test when it was done. Something said make sure it works unplugged and as I said that, 10seconds later the battery was dead.😢😢😢 Do you reckon this method will fix the battery? It was maintained very well before it was left to discharge or will it need another battery? Replacing will cost £500-600 which isn’t ideal, I wanted to upgrade my build but for this price it might make sense to upgrade to another scooter 💔 Please let me know 🙏

[@TechEyeMan]

sorry to hear that. look i would start by pulling out the battery and trying to see what the voltage is straight on the battery. sounds like some cells are damaged and discharging. worst case you might just need to replace a damaged cell. best case is you can try this method and it will be all that’s needed

[@Ultimaso6]

@@TechEyeMan thank you! I ended up testing the voltage on the battery, was reading 3-5V (from a 60V 20Ah battery) so likely some cells are definitely dead. I normally do these repairs myself but a local shop has said they can fix between £100-200. For this price I would love to attempt but purchasing all the tools required + the risky repair may not be worth the pain. This video helped me greatly thanks so much !!

[@Frandaman84]

Taking forever, the answers in the comments

[@LeeWinkler]

HEY!! that scooter that you are working on! I bought one online EXACTLY like that with a smashed control panel... do you have an extra around you scavenged? Tell me what brand it is so i can find one please! This was perfect for me! Is it a Gotrax? No label at all, anywhere...

[@TechEyeMan]

hey! All these no name ones are the same, they probably come from the same factory in china ha. Matter of fact i needed to buy a new control panel for the very scooter on the video because it’s screen was broken too. they are called “Controller Brake LCD Display 24V 250W Electric Scooter Controller Brushless G9D9” and come in a kit with the controller, screen and brake for 30usd on ebay. you just have to make sure your one is the same voltage (it will say on your controller) www.ebay.com.au/itm/Controller-Brake-LCD-Display-24V-250W-Electric-Scooter-Controller-Brushless-G9D9-/124279965591?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=705-154756-20017-0 good luck!

[@LeeWinkler]

@@TechEyeMan thank you so much. Exactly what I needed

[@siras2]

This is very confused and confusing - theres useful info in there somewhere but I think you need to reconfigure this into logical stages that'll actually make sense to people.

[@RoyceBlaby]

Hi great informative video I noticed you have a charger that is adjustable for currents and volts can you shear with me the brand and model of this charger pls and I’ll also subscribe to you Chanel thanks in advance

[@TechEyeMan]

Hi i bought this power supply a few years ago from banggood here’s the link [AU$145.53 30% OFF]Topshak NPS3010W 110V/220V Digital Adjustable DC Power Supply 0-30V 0-10A 300W Adjustable Laboratory Switching Power Supply US/UK Plug Electrical Equipment & Supplies from Industrial & Scientific on banggood ban.ggood.vip/14SMu

[@Inmate533]

Sucks that someone needs a full electronics workbench to use a perfectly good battery that somehow discharged all the way. E-bike and scooter batteries are not very user friendly.

[@TechEyeMan]

Lithium ion batteries to have limits. other battery chemistries do also discharge over time however recharging them causes no serious side effects but i do agree

[@Inmate533]

@@TechEyeMan If I were to take a guess, I'd say it's the little "management" circuit board that puts a parasitic load on these batteries and drains them faster than they should without it.

[@vojkodobrin3746]

Thank you!!

[@mashalshah555]

first you have to learn how to use the camera ....after watching one minute got headache

[@MadDad303]

This could have been 3 minutes, bro...

[@hawakboomstock5402]

Ssst

[@H4rleyBoy]

too convoluted to get to the point.

[@LidLockTV]

youtube has a function called most replayed... you can see where the highlight (usually) is at.

[@williamrosero4697]

I live Miami

[@mikecathrew9658]

Hi your maths is bad 4.2 x6= 25.2 not 29.4

[@mikegeld1280]

Dude,,,,c'mon man seriously, couldn't even finish watching, thx man 👎

[@lepianist9593]

BLa bla bla bla

[@jameskatarama9880]

Hey ,I measured my battery voltage and it has 71.4v but it is not turning on the scooter and its not charging.what might be the problem