Revive dead 18650 batteries (29) from severely damaged ebike battery pack

[@rickdff62]

Doood...I just fixed a couple of 18650s I had lying around and a Makita tool battery using you're technique. The magnet trick on the battery terminals to hold the leads is pure money. Thanks so much!

[@marbesky]

I have been doing this paralel charging sorcery since 2004 with many lipo cells and 18650s 95% worked perfect

[@kmuralikrishna1582]

Really...? I have collected old/unused/scrap laptop battery packs. That packs have opned/breaked for cells. I want/need help how to check each cell, which one is good or dead. If dead how to make it restore it reuse make them active for re use for e-bike. I have volt meter for check voltage yes I'm checking also. Don't know which one is good or dead. Ex if cell has less than 1v then can I assume that cell is dead cell? After open that battery I need to charge it even tho if not charging do I need to follow the above steps(in the vedio which he did for reactive cell). Please reply

[@JarMagno]

what happen to the remaining 5%?

[@anggorotriatmojo1200]

@@kmuralikrishna1582 is the cells gonna dead again after it's charged or it remains become a good cell ?

[@lorditsprobingtime6668]

@@kmuralikrishna1582 He showed you cells well below "1 v" and how to deal with them successfully here. He also showed that down to a certain voltage that was below 1 volt at least some can return to pretty much full storage capacity (which I honestly didn't expect) and he showed that below a certain point it does affect the capacity. Personally I'd use a half decent multi charger like a Turnigy 1 he used in another video of his I saw except set it to NiCd or NiMh on a LOW current like maybe 300 Ma for several minutes till it came up to where a charger could recognise it as a lithium pack rather than paralleling it with a fully charged one because of the high current I would expect this way, even there he showed it wasn't as high as I was expecting and it I was more confident I'd probably try his way. I would be wary with some of the extremely high discharge LiPo packs I use because some of the ones I use are capable of huge currents and I wouldn't like to risk either that way. You said you've got a volt meter, just follow his directions here, he showed you exactly what to do in this video. If you can get the voltage up enough for the charger to recognise the battery then charge it normally once started then see if it holds it's charge, then if you have the means see what capacity it holds. Once again, a half reasonable multi charger like the Turnigy one he used in another video that are very cheap for what they can do can also discharge a battery and record the amount discharged so you can find that out. Either way, one the same or similar are surprisingly cheap and very versatile.

[@AsifAli-pt1tr]

@@anggorotriatmojo1200 I want that answer too if you find out then tell me brother

[@SailnowFun]

Just want to add my kudos for this procedure. I had a completely dead Iridium satellite battery that wouldn't charge. I didn't have a way to bridge the one that does work without a lot of hassle, so I used my volt meter's 9v output connection to do the same thing... 30 seconds. Worked perfectly, and the battery now accepts the charge.

[@scltechhelp9812]

You are my Bob Ross of Batteries and narration! Awesome videos!

[@JanErik1986]

Nice recovery of those cells. Clearly show they are not trash just cause they were drained completely. I haven't tried with cells lower then 1V on the Opus, but i have tried with several cells in the 1,12-1,45V range, and they did all charge up properly to 4.2V, and didn't stop at 1.5V (I'm curious what causes the charger to stop at 1.5V only with some of these low volt cells though?). An important thing to keep in mind is that while over-discharged li-ion batteries can safely be recovered, they are not all fully stable until ~3V from what i understand. Below the stable voltage the charge current should be limited to around ~0.1C (ref. Sanyo ur18650f datasheet, as an example), so to be on the safe side i would maybe recommend to use a resistor to limit the current when paralleling cells to boost the voltage up to a level where the charger accepts it.

[@Arubapower13]

One of the best videos for 18650 batteries

[@bellapool]

listening to you puts me in the mood for some Pho & Banh mi

[@Menstral]

@20:36 If the voltage is low... they are "pretty much toast". Funny,, you have mastered that idiom.

[@pointedspider]

i like to use a USB charger with a stripped USB cable to revive my batteries. Apply 5 volts for 10-15 seconds and it will raise battery voltage from 0.5 to 2.8-3 volts quick. i have some 18650s that i revived over 10 years ago by doing this and they are some of my strongest, longest lasting cells i have.

[@johnylmararingo14]

pointedspider how did you put the wires on the batteries? just either side is ok?

[@ahmettay2382]

@@johnylmararingo14 positive to positive, negative to negative. parallel.

[@Majestiicc12]

Awesome!! Are there any videos you can recommend me, based on YOUR experience with this sort of thing, that I can watch to get a grasp on this subject? It is so fascinating and absolutely limitless potential.

[@ahmettay2382]

@@Majestiicc12 dude you talk like gman in Half-Life

[@paveljelinek772]

Yea it boosts the battery, extend it's life.. You can do it many times until the bat. is very old, say 10 yrs, then it will short itself sooner or later (won't hold charge, that internal short causes it to self-discharge/then it's really dead)

[@SaitoGray]

I've been doing it with a cut-off USB cable, works fine too ! Thanks a lot, you saved my battery salvaged from dead laptops !

[@Anonymous-it5jw]

Thanks for this video. I have 3 chargers very similar to the ones you used, so I can test and bump up the voltage on my old batteries exactly as you did. I particularly liked your home-made box for safely removing battery corrosion using a Dremel-type rotary tool.

[@mhmdsaleh3502]

Hello .. how much does this charger cost ?

[@mochapella]

thank you so much for your clear and methodical demonstration. much appreciated!

[@rockdzlss7664]

I found a good deal on Kobalt 24v 2 packs a couple weeks ago. 24v 1.5ah batteries 2 pack for $14.98. That's about $7.75 per pack with tax. I bought 4 packs for a total of 8 batteries. I plan to use this for Electric Scooters and LED light projects. Great videos. Keep em coming.

[@vuaeco]

That's a great deal. I don't think it would ever go that low again unless they are on clearance and close out the 24V line. They used to be $10 each but now $17. :(

[@amberyooper]

I'm glad I found this video! This gives me some really useful information for trying to salvage cells from battery packs that won't charge. I think that half the problem with battery packs that won't charge is due to failure of the charge controller in the battery pack. I could be wrong about that, but it would explain sudden failures of battery packs.

[@maxtornogood]

I'd be interested to hear about the self-discharge rates of these cells after being exposed to water & low voltage.

[@test-193]

My thoughts exactly... self discharge is an issue when I revive 18650's below about 0.500 Volts. Sure I can bring them back to 4.20 Volts and get reasonable capacity numbers... but sometimes their voltages drop over the next few days/weeks/months. I've been doing testing similar to this gentlemen and came to many of the same conclusions. HOWEVER, I use a TP4056 lithium ion battery "chip" charger that I custom made. I adjust the current to charge the cell at ONLY 50mA until the cell voltage gets up to 2.50 Volts. The slower you charge these severely depleted cells, the better the chances of reviving them. (And it's safer too.) Zapping them with 5 Amps is not the best approach! During the charging cycle, always watch the cell Voltage and ensure that the voltage is perpetually rising. If the voltage rises and then starts to fall after a period of charging, the cell has internal chemistry issues that can't be overcome and likely won't be salvageable. Another important thing to check is the cell temperature. No need for a fancy thermocouple, just touch it with the back of your fingers while it is charging. If it's HOT, stop charging immediately and recycle that cell!!! Once I reach 2.50 Volts I adjust the charging current up to about 100mA until the cell Voltage gets up to 3.00 Volts. From there, I put it into the OPUS charger at 200mA until it reaches 3.90 Volts. Sure, this takes a very long time to slowly charge them, but it is the best approach! Delicate, slow charging is much smarter. (I have found these severely depleted cells can sometimes turn into "heaters" when they get up to 4.00 Volts for the first time. Hence my recommendation to only go up to 3.90 Volts on the first charge!) Once the cell gets to 3.90 Volts, I discharge it back down to 3.30 Volts at 300mA rate. I have found that this "90% charge cycle" helps the lithium chemistry to revive more graciously. And it prevents the cells from over heating when pushing them all the way up to 4.20 Volts on the FIRST charge. Ok, so now we are back down to 3.30 Volts again after the discharge cycle. At this point, go ahead and recharge all the way to up 4.20 Volts... but I would still recommend only using a 300mA charge rate for cycle #2. Once we are at 4.20 Volts we can run a capacity test. I like to go easy and only use 500mA for the capacity testing of these severely depleted cells. By now, you've cycled the cell a couple times and it should behave well... no heating up during charging cycles!

[@reho4083]

​@@test-193thank you!

[@maukaman]

@@test-193Doesn’t the newer version of the to4056 do this on its own as far as slowly bringing over-discharged cells up to 3v or so with lower current before charging normally? I am curious about your method of adjusting the charge current of the tp4056 though. Did you add a variable resistor into the circuit or just change out the resistor to a specific value to get a specific charge current?

[@danieldanielson2650]

​@@test-193thank you,sir!

[@100roberthenry]

top tip on the parallel charge/ revive.... nice one man. gonna try this later.

[@Supercon57]

Thank you very much I have that same OPUS charger and was having a problem with some cells not charging because of their low voltage This is exactly what I needed!

[@williamvan909]

Out standing job well done buddy thanks for the great information on how to use these batteries wow .take care stay safe.

[@bojackson3073]

If the voltage doesn't hold then it's garbage also your power tool battery has some batteries in parallel so you need to cut the amps in half for your theory but it's probably fine short term.

[@Em.P14]

What a neat little dremel box

[@darkatmedia6095]

Hi. A million thanks for this!!! My gimbal batteries had stopped working and kinda stalled my work; worse off corona had borders closed. this came in very handy!!! My batteries are now charging properly Thanks so much

[@exploitingtheirpower]

Your videos are so awesome very informative and entertaining. I was searching how to brake down e bike packs and came across your video I’m glade I did now I can start restoring batteries

[@powerthoughtsontools4831]

I would have to review this video; but it is really commendable that you go through that whole process to truly determine a cell's potential for future use. Well done man! Would love to meet you!

[@CPUReD]

I'm glad im not the only one who loves this dudes accent.

[@gimmieliberty6514]

the dewalt charges at 4ampss but when current meets parrallel loads it divides, typicall battery packs are 4 P 4/1=1 amp

[@anuruddhalogin]

Learned a lot from this video ! Thanks from Sri Lanka.

[@Salimag]

Yeah you can also do that with an USB adapter and when the voltage of battery reached 3.2v, disconnect and put in a real charger. It's working, but after that the battery has lost some mah.

[@JamilKhan-hk1wl]

I used a LM2596 buck converter to bump charge the cells to about 2.5V for 10 seconds, then quickly connect the battery to a TP4056 and charge it fully. It works. Just be careful and make sure you dont connect it in reverse and it doesn't overheat

[@fm00078]

I stopped in to witness a Nuclear Explosion.. .. didn't happen. DARN (kid'n) Great work, now I can revive my pacemaker. THANKS

[@knicks252525]

Is the run time also restored or is it severely dimished

[@phester28]

got mine to charge to 4.2 but if left for a day or two they self discharge. If you do a load test immediately then they would demonstrate normal discharge rates so you have to wait a maybe a week and see what stays at the full voltage better than 4.1V

[@jo9732]

Yup. I have the same thing. Even when I try cycling them a few times some of them have like an internal parasitic draw or something.

[@metaruman333]

Thanks a lot.Revived a few low voltage 18650s just now by parallel charging.Nitecore UM4 did shit to charge those batteries.

[@aleksandersats9577]

You should buy one of those really cheap USB power banks. They come with no battery but they slowly charge the battery if it is too low which is the correct way of doing it

[@sciense3078]

get ready for explosion---lol! we have been doing this with garbage alkaline batteries that were once dead. i find by taping emery paper (fine sandpaper) on a table and holding the battery perpendicular to the sandpaper, removes fine film (enamel i think) buildup which dramatically improves power output. i sand it in a circular motion and back and forth until i can see the scratched cathode or electrode surface. i am sure the battery companies are sad that we are doing this stuff. Good work buddy!

[@masty1107]

How do we know , that this battery can not be recharged now and it should be thrown away ? Is there any indication , please guide. Regards.

[@dgb5820]

Watched this twice and learn so much

[@wattage]

I'm enjoying watching your project. Thx for sharing and explaining the steps along the way. Happy new year!

[@vuaeco]

Hi James, it's a pleasure. Happy new year!

[@vassiliskasassoglou9122]

@@vuaeco Hello, How can I find the discharge rate....High discharge.... Amps in a Liion cell ? Thanks

[@OvidiuMarin]

Thank you for sharing your knowledge with us, mate. All the best !

[@tootalldan5702]

Nice video but could you check those bad recharged batteries for their capacity? I'll bet you have an 80 percent of the power available. I would recommend just using the similar bad batteries as a set and not mix them with good batteries to prevent ruining the good ones.

[@mohamadsofitra]

Thanks for this valuable video.

[@craftymulligar]

You can use a tp 4056 break out board to charge nearly 0 volts. Least my batt was that dead.

[@Radar120155]

I understand that your source for the batteries is the original bike pack battery ? My project is to rebuild some Worx cordless power tool batteries(18650) but the dead batteries never raise in amperage just voltage . Used laptop batteries (18650) seem to work better for me . When you get this condition of Voltage but no amperage is it not retrievable ?

[@joeanania2257]

Great as usual...love your videos, in depth and informative ... Recommendations for a good charger that is not expensive?

[@Mr.Wednesday.]

His English is mesmerizing

[@Idahomie]

Did you fingers get very warm when you parrell booster those low voltage cells? how bout with the rapid d/c cell boost...fingers warm, cables warm. How thick of wire for your jumper cables'? thx

[@Beaudacid]

You are awesome, dude. Can I parallel charge an entire motorbike battery like this, or must I first disassemble it to its individual cells?

[@austinsears7879]

The time machine comment at 6:45 cracked me up

[@TexasPLNR]

Enjoy your battery charging videos!

[@alltobuy]

This will actually help me a lot . Not only me but nature too as there will be less electronic garbage then and my pocket 😜

[@prof8957]

Very informative, indeed! Do the low voltage batteries need to be charged first in parallel before charging them in full? Or charging them straight will give same result?

[@kondalaraokarneedi2955]

Is there any way to repairing 18650 battery discharging too quickly please give me reply please

[@MrIMacro]

I did the same thing and the dead battery started to have enough voltage to be charged but when i put in the charger it gets very hot even though i used many chargers!! What do you think is the problem?

[@deanp847]

This was a great explanation.

[@zodiacfml]

yeah, i dont know with other channels that parallel charging is bad. it is not like we are shorting the battery, even quick short circuits is not bad. Temperature is the bad guy

[@jo9732]

I’ve tried this with old junk cells but every time the cells do take a charge- but they just don’t seem to hold onto the charge overnight. Maybe they have some kind of internal failure?

[@ericklein5097]

Exactly they are dead dead. Fast self discharge means its time to recycle.

[@hurrai5519]

i have a roborock h7 vacuum, and i think its a 10s battery pack it dont take charge, but im thinking, what if you had a charger which you could set the voltage lower to charge it up a little bit? when you are pararell charging these 18650 batteries, im wondering what happens with the fresh battery when its discharging to the bad battery? does the voltage spike down or is it stable?

[@stevekent3991]

It’s a great philosophy to fix ‘broken’ things but faulty corroded Lithium Ion cells can be a fire hazard. Is it really worth trying to save a few dollars here and there trying to revive corroded cells? If there is no corrosion, go ahead and try and revive the cells but where there is already corrosion, I wouldn’t take the risk. I’m not knocking your videos because I think they are great, it’s just that you don’t mention Lithium Ion cells can be a fire hazard at the beginning of this video. There will be people watching this video (kids perhaps?) who have no knowledge or experience of how dangerous playing around with Lithium Ion cells can be.

[@vuaeco]

None of these got hot when I charged them. If they get hot when charging then they could be a fire hazard. It's important to check their temperature when you charge them. This applies to all good or bad Li-ion batteries, not just with the (corroded) ones you're trying to fix. All batteries (not just Li-ion) are fire hazard if you don't know what you're doing.

[@Вася-ш3щ]

Steve Kent If you clean up corrosion well, the batteries become normal ones and there is no reason for it to fire.

[@Вася-ш3щ]

vuaeco Actually, you don't need to stress low-voltage batteries by parallel connecting it to full-charged ones, cuz they may receive too big current. Better connect it to good batterie, which has just around 2.5- 3 volts.

[@heinousnesslesssweetness5857]

+@@Вася-ш3щ like jump start? Pls reply

[@Вася-ш3щ]

heinousness Less sweetness There is cool and cheap little "03962a module" for charging li-ion batteries. It can be found on Ebay or Aliexpress as "Micro USB 5V 1A Lithium Battery Charging Board". It costs around 3$ for 10 pcs. This module can charge even "dead" batteries with extra low voltage below 0.5V, such as in this video. Batteries with low voltage (less than 3v) this module charges with gentle current around 100ma, and after battery reaches 3v, module starts charge it with standart 1A current. I use it.

[@maru-orochigaruyasha2532]

Im curious to know where you obtained these li ion batteries? while im also looking around for online sources for salvaged recycled batteries,would any places you could recommend in any given area wen outdoors to salvage for lithium ion batteries?

[@codysmith605]

Navagation lights around the ocean and railway crossings.

[@realmstupid-on8df]

Is it a usps package cuz thats not something ur suppose to ship

[@ronaldopatt3928]

I have a problem with mines i did that and it says it is charging but its been a whole day and it does not charge the light turns red indicating its charging however y has no voltage in it what can i do???

[@michaelboot]

Im wondering if the corrosion under the wrapper will lead overtime to a gap in the metal? I checked a bunch of corroded cells and they charge ok but when I take the wrapper off for a closer inspection and I securely brush away any leftover corrosion; some end up with what seems to be tiny gaps (not holes) in the outer layer of the battery, visible the see the next layer :presumably cupper and some even leak a little electrolyte after brushing away the corrosion. Does this mean its no use and can become a hazard when charged? I filled up those tiny gaps with some solder and tested them with the opus charger. But im afraid to take too much risk. At 4.2 V a puncture in the battery can be a fire hazard. But when i fill up the gaps, maybe its just fine. What’s you opinion? Thanks

[@maximo4742]

For the price the hard to throw away. Thanks

[@wojomojo]

Maximo474 That may be, but there’s goodness in experimentation and learning

[@Utopiec1]

Many thanks for your films.

[@quangvinh2145]

Hay quá Vua ơi, cám ơn nhé!

[@gianluca458]

I hame some batteries to recover [8] but the charging current at 4.2v is ONLY 0.55 MICRO AMPS!!! Literally. [0.55 uA] [or 550 nA]. The current passing on my body at 4.2v is even higher! [5 uA]. It is impossibile to recover them? Or THERE is a method of raising the voltage way higher for only a fraction of a Second or something LIKE this? PLEASE can you help me? I really need those batteries....

[@evakantt]

Can I use for Sc2006 Phillips Lumea? Thanks!

[@fludrbywest3886]

Do you have a place to purchase the protective cover replacements for the 18650 battery’s?

[@rudycramer225]

Very well done and explained.

[@rickc2222]

Great video! very helpful info! I have a question though: How do you know how much capacity is left without actually load testing? I have some used drill batteries i was using in my flashlight for the past 2-3 years. I bought some new Panasonic 3400ma NCR18650B cells was surprised by how much longer they lasted. I tested full charge to shutoff time on my flashlight and found my old batteries only lasted 1.5 hours, and the new batteries lasted 4.5 hours! The old batteries still take charge and appear normal, show 4.2V when fully charged, but their capacity is only 30% of what they should be approximately. I had no idea how bad these cells were until I tried new ones. So my question is: how can you say those old cells are good without actually doing load testing? I'm using a cheap Littokala charger, which does a good job so far, but it does not tell me the Mah capacity remaining on my cells. Your charger appears to do that. Also old/worn cells can have a high rate of self discharge when stored...

[@vuaeco]

You have to load test it to determine capacity. There's no way around it.I'd recommend the Imax B6 if you're tight on a budget. Or just get the Opus like the one in the video.

[@rickc2222]

@@vuaeco ahhh i see. from your video i thought maybe you were just going to assume the cells were all good and build a pack....so you will load test all those cells to make sure they are good. What is your preferred method to load test?....flashlight takes too long lol

[@kortastabukle]

Rick Couture man, this Opus charger has “Charge test” mode, which he was doing in the video. You can choose charge and discharge current (200, 300, 500, 700 or 1000 mA) and the charger first charges the cell using the selected current then discharges and charges again. After the discharge the capacity in mAh is shown.

[@leoyru.3361]

u take a multimeter and measure how many amps this flashlight is using .and example: if it uses 1 amp u multiply that for the time they hold so it would be 1500mAh for the olds and 4500mAh for the new. . if this 3400 for the new is correct that means that the old have 1133 mAh . this is an aproximation because when the battery is draining the voltage keeps decreasing and that in some loads makes the current decrease too. but it can give u and idea

[@rickc2222]

@@leoyru.3361 thanks, i actually bought the Liitokala Lii-500s which has a discharge test mode - just arrived today!

[@fludrbywest3886]

Can you revive the coin or button lithium batteries this way too ? Is there a way to recharge the button cells? Rather is there a charger for lithium ion button/watch batteries?

[@fat_pigeon]

Coin cell "lithium" batteries are generally lithium-metal, not lithium-ion. They can't be recharged. Rechargeable button cells (NiMH and Li-ion) do exist, but are generally permanently wired in devices which trickle-charge them, so reputable chargers are hard to find. Note that coin cells are designed for very low charge/discharge currents, so they should not be connected to a charger for regular-sized batteries (even the lowest current setting would be too much). You could use a power supply with a configurable current limit. Look up the datasheet for your cell first to determine the current and max voltage to use; rechargeable button cells sometimes have exotic chemistries. If you do have a 3.6V Li-ion coin cell, I know Adafruit sells a charger (product number 1573), but I haven't tried it.

[@Scrumper66]

Good video for explanations! Thanks for all! :)

[@maukaman]

Man, that’s not great for a battery pack to be charged at 4 AMPS a cell every single time. I usually try to stay below 1 amp per cell when charging any of my battery packs, 500 mA if I have plenty time to charge before use. I’ve had a couple of EGO 56v packs that I would occasionally charge with 2+ amps per cell but those cells are high quality and wrapped with a thermally conductive compound to reduce heat. I don’t consider limiting to 500ma per cell being overly cautious for most 18660s, and since I use an adjustable current/voltage power supply for just about all my batteries I can choose whatever current and cut-off voltage I want. No sense in fast-charging when I’m not in a hurry, it’ll just reduce the lifespan of an expensive battery pack.

[@muhammadabdulbaset229]

Thank you for great work Is it possible to restore lithium Ion battery capacity to original like new cell?

[@amirgedon]

What magnet u use?

[@neilfpv]

A cell in 6s lipo battery is only reading 0.2v. My charger is giving out an error when charging my 6s lipo battery. What should I do? I tried the nicd or nimh technique, the charger also complained.

[@Biffo1262]

I recharge low batteries on a cheap bench charger. Far safer and far more control.

[@luckylarz4269]

So meaning a variable power supply? so you can control the amount of amp you're putting into it? Like what do you do for voltage and amperage on a battery that low? Are you supposed to go over the 4 volts with a lower current/amperage? I have so many dead cells I've just thrown them in the bucket haven't really tried to revive them cuz I'm worried they will have catastrophic failure lol. Curious what you do and how you do it to be successful I'm sure it doesn't work on all of them?

[@miguelrondon]

Is it possible to apply the same principle with 1.2V AA or AAA batteries with the corresponding chargers?

[@davidmarberry5565]

did i miss where you told us what charger you are using ?

[@DadSkool]

i have had trouble with chargers in the past. i like the look of yours, do you recommend the chargers you have? If so can you please give me a link to buy one. Thankyou in advance. also thankyou for your informative videos

[@vuaeco]

I would recommend the Opus chargers. They are very good chargers, at least for me, so far. They are a bit expensive though (for a reason). I don't have any affiliation with any sellers so I don't have a link for you. I bought them on ebay. You can find them on ebay or Amazon.

[@DadSkool]

thankyou, thats better than buying a cheap charger every couple of months. May i ask how long you have had the charger for please

[@treeclimbing7798]

Johnny James -OPUS BT-C3100, $31.20 “beingproductive”(14) on eBay /also- MiBOXER C8 try eBay & Amazon $39.oo

[@satinderk3313]

Can revive a Moza Air 2 18650 battery with another good battery from the same set? Thanks.

[@vickisabella130]

Hey bro love your video keep it up have a couple of questions just starting to know about letting your battery I would like some advice from you trying to build a 36 volt 10 ah will greatly appreciate your help

[@bobravenscraft5376]

I split packs. On hobbycharger. That way. You can make packs out of. VERY QUESTIONABLE CELLS. And if you get a short. Replace halfpack. Ezpz

[@ionut8091]

I did the same but some but not all want to take the current and go down back and the life spam are 10-20 cicle left may be

[@valdomirosilva4127]

Very helpful video> Thank you

[@ozas258]

is it possible to paralel charge somehow without having lall your gadgets ?

[@MrHimer12]

Paralel charging deeply discharged cells is not a good thing for them. They take extreme current in very short period of time which usually screw with the structure. In good quality cells, or japaneese ones usually that will reduce lifecycles and capacity in bad quality cells or no names it is going to be random. If you want to minimise already done damage for overdischarged cell then the best method to bring them back to life is to bring the voltage to 3V with bench power supply and really small current like 50mA or even less, let it sit for a while after bringing it up to 3V and then you can proceed with normal charge rate.Of course best method would be small trickle current but that needs circuit I have some VTC5s which were stored at 1.65V and I am curious when they will fail. Their internal resistance is still okay and nice, they hold almost 90% od capacity. I wonder when they will start to fail in high drain

[@Ozzy3333333]

100% agree with this

[@rickyrodrigues4277]

I have a 14.4v battery for my vacuum that doesn't hold a charge. I wanted to try this, but I have two questions... 1) Does it have to be charged with another battery with the same Voltage and AH levels, or can I charge my 14.4v battery with say a 20v battery and it simply wont go above 14.4? 2) The batteries are wrapped in a blue plastic wrap, where can I get more of this to re-wrap it? Or is there a way to take it off and put it back on?

[@jo9732]

Yeah. Just charge with a 20v until you get the battery to like 10v or something. Then the normal charger should finish the job. It’s better to pulse the charge. Watch the temp. Don’t worry about the blue plastic. Use electrical tape. Cheap.

[@gideonlapidus8996]

Very well explained

[@williamcleophas3981]

Must you use an amp meter to parallel charge?

[@evakantt]

Can I use normal AA battery instead of laptop battery (yellow one)?

[@pjgolden5265]

Hi vuaeco, I love your battery salvage video. I just opened my ebike battery to check voltage, it’s 2.6v, battery looks as new no damage. Can I connect 3 x 12v car batteries to the full pack ( 3s11p) / rating 40.7/6.4ah 260.48wh to raise the voltage to a chargeable level (3v ?)? There is a bms attached but no balancing wires.

[@recnelizgaming]

Wow! It's work! I've used a wire and connect it using parallel . I'm shocked when I connect the last wire because it sparks. But after I count to 10 seconds, my dead battery is slightly heated but when I charge it , it's working perfectly! 😮😍 just be safe not exceeding 10 seconds for the safety

[@recnelizgaming]

But it's get over heated while charging. Why???

[@golferron7220]

Can these batteries be used as replacements in a Ryobi battery pack?

[@morrishunt1292]

Do not throw the corroded cells away, take a look at the inside safety circuit.

[@fat_pigeon]

These are bare cells. There is no safety circuit inside.

[@wraith8117]

You are a legend i love your vids

[@TheRealFOSFOR]

When I try this on my batteries.. the wire starts smoking and the charged battery turns extremely hot. No voltage increase on the dead battery... PS: Why don't they just make chargers that do this automatically?

[@TheRealFOSFOR]

@@tempusername-l5d Humm. Intriguing, I think I must get that then. thx

[@STePHeN320_12]

I was waiting for a new charger cause my old one broke I drained a vtc6 and it won’t charge tried to jump start it using a fully charged 4.2volt Vtc6 but it will only bring it up from .5 of a volt to .8 and it goes right back down to .5 within 10 seconds. Tried doing it multiple times and even let them sit together for over a minute no change. Don’t know how it went bad was just working before the new charger came today

[@Coy2995]

hi question u can use a good battery to parallel charge a dead batt?

[@rimuru5942]

what type of magnet should I use?

[@paulgtal]

A metal one .🤠

[@thediydude4110]

Where can you get a bunch of old dead lithium drill batteries?

[@vuaeco]

Ebay, local electronic recyclers, or just dumpster dive! :D