How to Fix Ryobi Batteries, with Simple Tools - 1170

[@MyPlayHouse]

Thank You all for watching and saving/releveling all your Ryobi batteries. If this simple fix, does not help your battery I have just done a video on replacing the BMS circuit board : kzbin.info/www/bejne/jamVnXZsq9h4oNk

[@helenebarton]

Hello Any video to PCB 4Ah or where put aligator in this PCB Thanks?

[@DarrenRattew]

Tried your 9v battery trick, result, can now recharge my battery, Thank you.

[@MyPlayHouse]

Great job! and thank you for letting me know.. Makes me happy to know I helped :-)

[@jdaniels1313]

Fantastic! Made the process make sense and very feasible for any DIY person who can follow basic instructions!

[@MyPlayHouse]

Hi @jdaniels1313 Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@Gavin10BKN]

You are a genius!! Thank you so much for this video. You saved me over $100 in having to buy new batteries. I did exactly as you showed in the video and Shazam, batteries are charging again.

[@MyPlayHouse]

"You are a genius!! " Well I am a little too modest,, but on the other hand it would be quite rude to say that you are wrong!! :-) Happy to help..

[@Gavin10BKN]

@@MyPlayHouse I am so tired of "designed obsolescence" by engineers who sit up late at night thinking of ways to make one small part of a product fail/break so the consumer has to go buy a whole new one.

[@TonyMc-f1y]

Briiliant. Adopted the 9v battery "method". After 10 minutes I was able recharge the battery. Cheers

[@MyPlayHouse]

Awesome,, glad to hear that!!

[@MichelleGraham-y3q]

Thank you. I followed your instructions and used a good new Ryobi battery as my power source. Once l had power in the batteries it didn’t charge on the charger at first and the red light kept blinking. The battery felt hot so I put it in the freezer for a minute. Back on the charger now and charging fine! I am so glad I didn’t throw it out. Thank you so much for several fabulous videos.

[@MyPlayHouse]

Okay,, that is cool,, powering a empty ryobi battery from a full one,, is a bit a kick in the @$$ for the battery.. and charging it up a bit slower,, is to be preferred,, the two 9V batteries does it slower,, and in this case that is better. But also happy you safed your battery.

[@CindyVine]

Thanks so much for fixing my battery and delivering it in person to Portugal!

[@MyPlayHouse]

No problem,, that was an easy fix,, my biggest worry was if I could get it through customs,, and as you sayed,, there was no problems.

[@rkgrkg1384]

Thank you Professor! Very instructional, practical and helpful.

[@MyPlayHouse]

Hi RKG RKG Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@thomastaylor8657]

I jam a flat head in and break the pin on the safety screw allowing a normal t10. Pencil lead on contacts will get some batteries accepting juice. Plugging and unplugging from charger ever 3 seconds about 10 times gets some to start. Cell phone charger will charge individual cells. I do a die down on toped up cells. If the bms is bad, keep the battery pack add it in series to another good pack.

[@VeritasPraevalebit]

@ My PlayHouse I just discovered that I made the same exercis with an RB18L20 battery as you do in your video. But I accidentally discovered a way to revive it without taking it apart. At first you connect a DC source to plus and minus on the battery. A rubber band can be used for this. As shown i the video, using wires with crocodile clips the Ryobi power supply can be used for this. What I discovered was that when I wet my thumb and index finger and held them against the plus and the terminal between plus and minus the charging started. I also tried to replace my fingers with a 150 kOhm resistor and that worked too. I have not figured out if it is safe to replace the resistor with a short. When I found this out the charging was well on its way, but I think it would be sufficient with just a few minutes to reach a sufficient battery voltage to proceed with the Ryobi charger. It seems to me that these Ryobi batteries should shut down with more juice left in them. By the way, many car battery chargers behave in the same way, they refuse to charge a dead battery.

[@MyPlayHouse]

Very cool,, Thank You..

[@michaelgrinder5946]

Thank you for sharing your knowledge on how to fix these batteries.

[@MyPlayHouse]

Hi M. Grinder Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@ss67camaronut]

Thank you sir - for this information- I can't wait to try this on half a dozen batteries I have that will not take a charge. ... subscribed . I will let you know what happens. I've a small fortune in these dang ryobi batteries ( for my budget) and they've frustrated me greatly! I've found that they do not like cold-- like a unheated garage or even left in a car/truck . I hope that this works for me . I'm in the US/ Pennsylvania.... thanks very much in advance. I'm going to binge some of your past posts to learn more. Your teaching/explaining is top notch !

[@MyPlayHouse]

Best of luck! and remember to charge them up,, when You have used them. If you leave them discharge for long (and especially in the cold) they might do this,, not charge.

[@volovojuntti24]

I was just searching for reviving dead batteries, and this popped up!

[@MyPlayHouse]

It is a very fresh video.. hope you can use it..

[@volovojuntti24]

@@MyPlayHouse It was really useful, thanks for the 9 volt battery tip!

[@albion2742]

Thanks for your expertise. could I use a motorcycle 12v battery to recharge an 18V Ryobi battery like you did.

[@MyPlayHouse]

Yes,, if the battery is very powerful,, it is a good idea to put a 12v light bulb in series to limit the power,, for example a normal 55w car bulb.

[@stevelandells8490]

Great video on the repair of the Ryobi Battery - much appreciated :-)

[@MyPlayHouse]

Glad it helped :-)

[@billseewald355]

Have a relatively new battery that quit working or charging /it was replaced under warranty/ question is the battery repairable? It blinks red and green at the same time when placed in the charger ? Is this any easy fix any help would be great thank you

[@MyPlayHouse]

If you have the broken one,, you can give it a go..

[@geoffsnelling807]

thank you just got first of 2 packs taking a charge, i used car battery charger as my power supply for about 30 mins to boost the ryobi pack

[@MyPlayHouse]

You only need like 2 minutes,, don't over do it.

[@Sasoon2006]

You should have checked each cell voltage, because they will most probably be out of balance. That happen to my ryobi batteries. They were not that low in total voltage, and could be charged with Ryobi charger, but when charged fully they held little charge. This was because couple of cells were lower voltage than others. E.g. some cells would be 4.15V and some 3.4V. So charger would stop when some cell reaches full voltage, and BMS would stop battery usage when one of the cell would reach low voltage. So I used simple USB Li Ion magnetic charger and put it on each low voltage cell and charged them to the same voltage as rest of the cells. Google for "Olight UC" charger to get an idea which charger I am talking about. This makes it easy because it is simple to put charger on the single cell with magnets, without disassembling cells. And this works for any batteries. This way I also fixed Parkside X-Team 20V batteries.

[@ZnakeTech]

I think the circuitry in this battery does balancing, notice the extra wires going in between the cells.

[@dennisolsson3119]

Aldo, the combined voltage were less than 2V. Not saying your point isn't valid in maybe most cases, but here I think the BMS and the cells themselves just discharged the battery slowly during many months of non use.

[@Sasoon2006]

@@ZnakeTech My two Ryobi 2Ah batteries were completely out of balance, full charge was around 18V. After I manually balanced them, it is almost 21V

[@Sasoon2006]

@@dennisolsson3119 yeah probably you are correct in this case. But after you fully charge them, if total voltage is less than 20.5V you will probably need to balance them. Mine were 18V fully charged, and almost 21V after manual balancing.

[@dennisolsson3119]

@@Sasoon2006 i thought the BMS balanced them on Ryobi, but I will definitely open mine up and check. Is an easy way to renew them if that's all they need :)

[@johncastellano7154]

Wow how many batteries I have I hope this works ty so much for this info. Going to check out all your videos

[@MyPlayHouse]

Hi John Castellano Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@Silver_Surfer_1]

Hi there. Good info indeed. Thanks. I got a couple of Ryobi batteries wet and now they won't charge 🤔. They seem incapacitated. I've had other brands that have gotten wet with no problems. Any idea what is going on sir? They are not that old.

[@MyPlayHouse]

No I have gotten another one that had gotten wet,,, and I have still not figured it out,, it just blink with one diode when you press the tester.

[@topc5826]

I have the exact same 2Amp battery as shown in the video and tried the charging as you showed but the battery pack got real hot after a brief charging time, only got it up to 11 volts. seems like one of the two 3-cell series packs has a bad battery? Charger started blinking green then after a few seconds stopped blinking green. guess I need to disassemble the three in series packs and test each one individually. Do you know how the charger works? There is the plus + and minus - terminals and a 'T' terminal plus two smaller 'T' terminals but only one has power. Does the 'T' stand for Trigger? I also noticed that the voltages are reversed on my fluke meter when I check the voltage from the Intelli-charger on the plus & minus contacts down inside the tunnel of the charger, but it is only around 3.8 volts and not 20 volts, and the 'T' terminals, the center one in the tunnel and one of the two smaller tabs are the same voltage, 3.8volts. So what "wakes" up the charger to output 20 volts and why are the polarities reversed?

[@MyPlayHouse]

You probably have to check every cell,, with a volt meter,, and charge them one by one,, or discharge,, if they are to high.

[@jimbendtsen8841]

Great! I think this is the 60th video on how to "relive" them.

[@MyPlayHouse]

I have done 3,, but looking at the comments,, this is helping so many. And I like that. Why are you watch them?

[@knc5412]

Hi Morten, very nice experimentation with direct linking battery sources... I now have a small question that perhaps you are able to provide some input, suppose in a battery pack, only one of the tacked batteries is found to have low voltage whereas the others are still within decent voltage levels, do I simply just balance them all manually like your experiments in this video, or do I directly link the specific battery thats weak with a fully working single battery... and for safety purposes would I need to desolder/seperate the battery to do so or could I just target the single battery without having to disassemble it off the other connected batteries?

[@MyPlayHouse]

I would directly charge up the one cell, and put the battery back on the Ryobi charger to let the BMS pcb sort it out.

[@AstrealOne]

Thank you for the beautiful information it works like a charm

[@MyPlayHouse]

You're welcome! hope it helped you.

[@antoniohurtado6037]

Thank you for your information I just did what you recommended and it works. Thank you god bless you.

[@MyPlayHouse]

Happy to help save yet another Ryobi battery :-)Thank You!

[@robertgianchino3954]

Can you do this without pulling the battery apart and use the terminals or are you bypassing the circuit board. Sorry if this is a little naive.

[@MyPlayHouse]

As far as I know,, you need to take it apart... and yes we are bypassing the circuit board (the BMS)

[@VeritasPraevalebit]

@@MyPlayHouse Hi I think I fixed it, see my comment 13 days later :-)

[@ПавелИзмайлов-э7н]

Greetings friend. Please tell me. The third LED on the accumulator blinks.What's the breakdown? 18v

[@MyPlayHouse]

I have no idea.

[@MrSeghrouchni]

Good explanation. 🇲🇦 Morocco

[@MyPlayHouse]

Glad you liked it!

[@JUSREEL1978]

So do you have to do this every time you have to charge them? If not, how often is this trick to be applied?

[@MyPlayHouse]

No,, do the trick and charge them up fully,, and it should be good,, for many recharges..

[@yulungjasonlee]

Can I do this is one of the cells is reading 1.6v where the other 4 are all around 4v?

[@MyPlayHouse]

No,, you should charge up the 1.6V cell to 4V,,, and check if it stays there.

[@yulungjasonlee]

@@MyPlayHouse I was able to balance the cells all around 4.16v is there a reason why at the terminal that plugs into the tool why that would read the 5 cells in series is only 8.xx voltages instead of the 5 cells added together? Which is almost 21v?

[@Qriusme]

were they able to hold charge effectively after charging them up?

[@MyPlayHouse]

Yes Yes,, they worked just as well as before,, but it is a good idea not to wait to long doing this.

[@sklee1644]

Where can I get this small power supply?

[@MyPlayHouse]

There is links in this video : kzbin.info/www/bejne/aYGTYmeVnKZ9i80

[@raymondgarafano8604]

looking at the bat with tower on right I drilled into the R, on backside into the M. the wire for M was + so R being -- hooked to 12 v motorcycle bat and bat came up to around ten then when in chrgr I got a green flashing lite later a solid green.

[@MyPlayHouse]

Hi Raymond Garafano Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@raymondgarafano8604]

@@MyPlayHouse I am trying this on the 3 amp bat. I got the #10 security bit and got it opened and juiced the battery but it is not coming back so This battery could be somewhat older, it has 10 cells in it.but being able to get the smaller 1 charged easily is good.

[@scottfenton7607]

Can you use a trickle charger? 1A

[@MyPlayHouse]

I would expect so,, but give it like 5 minutes.

[@tucker68red]

my battery is showing 19.2 volts , but when I put it in my ryobi cordless vav it powers up for a second but the stops , thought it was the cells but I think it must be an auto cut off on the circuit board .. but cannot see any damage .. any ideas 💡 🤔

[@MyPlayHouse]

Out of balances cells,,, measure voltages and charge up any low ones.

[@raulhermosilla3092]

Do I really need to open the battery to charge it. How about place the terminal on the top of it and use clamp to hold it.

[@MyPlayHouse]

No,, there is electronic protecting the battery,, you need to bypass that.

[@ajciccone88]

Great video was able to get my battery apart and try this but sadly no luck.

[@MyPlayHouse]

Sorry to hear that,, If you want to donate your broken battery for me to have a try.. My shipping address is under the about tap.

[@davet982]

put a 12v car tail lamp bulb in series and control the current flow and check voltage often as cell max is 3v in most cases you can wake a battery up but sledge hammering it can cause fires that are very hard to put out

[@MyPlayHouse]

Hi @davet982 Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@mariopina2835]

Where can I find the batteries to repair a battery of 18V?

[@MyPlayHouse]

Ebay, amazon,, just search for "18650"

[@rogertyler3237]

I Have A Brandnew Ryobi Battery but The Testlight Dont Work. But It Dose When Placed On The Charger

[@MyPlayHouse]

If it’s brand new ,, you should have it replaced under warranty.

[@rogertyler3237]

@@MyPlayHouse But It's A Year Old

[@j3ffn4v4rr0]

I have one of the older One+ battery packs....the connector looks exactly the same, but the pack is a little bit bigger overall, and there's no LED indicator. Inside, there's no circuit board, just the batteries. Does anyone know how to reboot these? I'm betting the process is the same, I'm just unsure where to touch the wires.

[@MyPlayHouse]

It sounds like that might be an old Ni-Cd battery or NiMH,,, this fix will not work for that :-/

[@marcoagarza]

Can this be done with a car battery??

[@MyPlayHouse]

I will not recommend it,, there are SOOOO much power in a good car battery,, use 2x 9v batteries much safer!! (it is possible with a car battery, if you put a lightbulb in series with the ryobi battery, it is almost safe)

[@ccscomments757]

I like it. I have many partially depleted 9V batteries. Any reason why I shouldn't daisy chain more than two?

[@MyPlayHouse]

Two 9Volt in series,, is 18Volt,, and that will do it. If your batteries does not do it with two,, try 3

[@OmarTrinidad-bm6er]

Thank you for this ❤

[@MyPlayHouse]

You're welcome 😊

[@ZebbMassiv]

What kind of batteries are in there? My guess is muRata vtc4

[@MyPlayHouse]

I think something a little bigger,, as the Sony Murata VTC4 18650 2100mAh 30A would only make a 4.2A battery and this is a 5A,,, so 2500mAh cells are needed.

[@wb8nbs]

I am surprised that you have to take the battery apart to do the bootstrap charge. If you can measure voltage at the outside terminals, they must have a hard connection to the cells.

[@MyPlayHouse]

If there is a shortage of a cell in the battery,, it could be bad to start charging it.

[@bluesroc]

I have a Ryobi battery and it charge full 18V snap in the battery in weed eater and Dies charge the battery its at 14.5 try this 4x and get the same results how do I drain the battery do you have any ideals on how to fix this problem

[@MyPlayHouse]

It unfortunately sounds like it has a bad cell inside.

[@bluesroc]

My Play House Ryobi battery I pop off the cover and tested the battery at 2 at the pole read 14.65 in side on top of the cells readed 15.13 cell 1] 3.01 2] 3.00 3] 3.04 4] 3.01 5] 3.05 what do i do now

[@gatorgrowl7325]

Um what happens if you hear a pop and see a puff of smoke. Battery dead for good?

[@MyPlayHouse]

Yes ,, that does not sound good :-/

[@jeddiajones4570]

There is a much easier way. Just keep putting the battery in and taking it out of the charger, just enough to make and break contact, and after a number of times this will put enough charge in the battery so the charger can read it.

[@MyPlayHouse]

I have not tried that yet,, but have heard of it....

[@midnitelitecompany]

I tried it. It eventually gave it a few volt charge, but did not work.

[@RodyWalker]

This just worked for me!

[@robertolantigua3945]

Would these "hacks" work to revive a 40v battery?

[@MyPlayHouse]

Yes kind of,, I have a video next friday, fixing a 36/40V Ryobi,, that stopped charging.

[@robertolantigua3945]

@@MyPlayHouse looking forward to it!

[@liamstevenson3896]

​video out yet?

[@MyPlayHouse]

@@liamstevenson3896 Yes,, here it is : kzbin.info/www/bejne/oV7Th6l_ocScpqs

[@TomTheMowerMan]

Hey mate, i’m super stupid putting an american battery into a europe plug in, it all died, do you have any idea to solve it?

[@MyPlayHouse]

That sounds bad 😬 I have done a video on replacing the BMS board in the battery,, but the cells need to be good.

[@MarkSWilliams27]

Interesting video. Thank you!

[@MyPlayHouse]

Hi Mark Williams Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@stephenformosa471]

My battery charger goes green and blinks but battery does get charged

[@MyPlayHouse]

That is a new error, that I have not come across :-/ If you would like to donate the broken battery, for me to try and repair,, to help the next guy,, my shipping info is under the "about tab".

[@edgarh.5727]

it worked thank you

[@MyPlayHouse]

Glad it helped! It is awesome to know I helped you with your battery problem,, makes my day! Thank You.

[@rossschimke2577]

Could you use a normal 12v battery charger?

[@MyPlayHouse]

I do not like to say yes,, because there is a lot of power in a car battery,, and it could do a lot of damage,, if something else is wrong.

[@eric_seguin]

You rock. Thank you.

[@MyPlayHouse]

Hi Eric Seguin Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@rschrader]

So sad Morten that you didn’t test the 2 9V batteries first by licking them with your tongue… 🤣 That was fun as a child.

[@MyPlayHouse]

I did do that,, the first pair I found, was so depleaded,, that I got another pair for the video.

[@rschrader]

@@MyPlayHouse Showing your new ‘tongue battery tester’ might have made for a good April Fools Day joke. 😁

[@zx8401ztv]

Hopefully there isn't a weak cell that's letting the whole pack down. The case has a little room at the front for a small socket, connect it to the cells and you can give it a kickstart when ever needed, the socket allows you to measure the overall battery voltage 😀 P.S While you were away i broke into your house and wiped your servers lol.

[@MyPlayHouse]

I think he batteries are fine... while I have been in Portugal and enjoying the weather, I have seen on my surveillance that it has been snowing in Denmark,, so I have been sending pictures of orange road side trees and palm trees.. to my mom,, just pure evil :-)

[@zx8401ztv]

@@MyPlayHouse Ha ha , you are evil but i like it :-D Here in the uk the weather could not make up its mind, sunny then rain then windy with bits of sunshine and unexpected rain again. Just when you thought it was safe to go outside...... nope lol.

[@MyPlayHouse]

@@zx8401ztv I am slowly moving back home now,, so back to the cold.

[@zx8401ztv]

@@MyPlayHouse " There's no place like home." An old saying but true 😀

[@HGR693]

So.....what happens when your friend depletes the batteries next time that she uses them.....?

[@MyPlayHouse]

If it is charged up again,, it will be fine.

[@GlenDoer-gq1rs]

Need a PBP005 BMS??

[@MyPlayHouse]

Hi @GlenDoer-gq1rs Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@RayW808]

We define "Simple" very differently...

[@MyPlayHouse]

We might,,, :-)

[@MrTutubowey]

Thank you

[@MyPlayHouse]

Hi Z Z Thank You very much! glad you liked the video :-) Thank you for watching! :-)

[@johnpainter5750]

Is Ryobi laughing with costumers?

[@MyPlayHouse]

Sorry I do not understand,, was that something I Sayed ? I have made so many videos, hard to remember all my little jokes..

[@gavindurfee6542]

We'll just call it a very large typo on my behalf

[@MyPlayHouse]

Sorry,, not entirely sure what this is about.

[@gavindurfee6542]

@MyPlayHouse Honestly, neither am I?? My most sincere apologies lol, as I am super thankful for this video, and would have never said that!

[@matthewlandon1697]

First

[@MyPlayHouse]

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[@orencomputerelectronics8751]

i think the charger had current limiter. If cell voltage is 1.9v and you try to charge it at 12V i=(12-1.9)/charger resistor. i think you can solve this problem if you chrage it first in half voltage. Let say the bat ratted at 12V, the charger voltage upto 19V. If you use for 6V BAT , you will not need all this bulshit. After first vharge to 6V , use the 12v charger

[@MyPlayHouse]

I do not think the BMS is letting anything in..

[@orencomputerelectronics8751]

@@MyPlayHouse you dont test it. bms limit the max current charge. one way to lower the chrage current , is use lower 6V vs 18V. in ryobi had 2 type's of chager 18V / 40V the BMS is in the battery(only on lit-on) , can charge aldo ni_cad bat. i said,without open the BAT case. connect 12V or 6V power supply, after one hour the voltage in cell will be up. how the chrager now it had problem? 1) max current from charger 2) error signal from bat.

[@michaelfischer6984]

@@orencomputerelectronics8751 The BMS prevents charging based on minimum safe voltage for the cells.

[@orencomputerelectronics8751]

@@michaelfischer6984 i agree with you , in bms had current limiter. Then if you charge in lower voltage=lower current. after hour when the voltage get up , you can connect the charger 18V. The problem was when the cell was 1V total and you try charge in 18V. The bms stop the charging.

[@jsevcik]

Hmm, sorry to say, but I think this is below your standard. In principle the same as the previous video, but now toping up with Pb battery and 9v batteries. You know that there is a reason why the battery BMS refuses to charge..... Lithium batteries should never fall below the minimum voltage, although they may take some charge they will not be very good and it is very likely you will need to recycle them soon anyway.....

[@MyPlayHouse]

I have done quite a bit of charging up and down 18650 cells,, way over 1000,, and often a battery can be at 100mV,, and it can still be charge up, and tested it will still have good capacity. bight have been a 2500mAh, and now it will be a 2200-2400mAh. Still a good battery.

[@test-193]

​@@MyPlayHouse I agree with your statement, as I have also salvaged over a thousand "low voltage" 18650 cells. The only thing that I would do differently is I would recommend that you charge the cells MUCH SLOWER. There are TP4056 modules specifically made for 18650 lithium cells. These modules are internally programmed to automatically drop the current down to 100mA until the cell voltage reaches about 2.90 Volts. At 2.90 Volts, it will drop out of "trickle charge" mode and kick up to a higher current that you can easily select via one resistor. (I use a 10k pot in series with a 1.2K resistor to allow for a wide range of 50mA to 1000mA.) The TP4056 will continue to charge from 2.90 Volts up to 4.10 Volts at the resistor-selected constant-current. (e.g. 10Kohms = 130mA, 5Kohms = 250mA, 1.66Kohms = 700mA, 1.2Kohms = 1000mA. ) From 4.10 Volts up to 4.20 Volts it switches to Constant Voltage mode and you'll see the current slowly taper off. Tip#1: Here's my point: The SLOWER you charge them, the more likely they will be "good" cells again. Tip #2: For the very first charge cycle, use the TP4056 module set at only 200mA, but don't charge all the way to 4.20 Volts! Only go up to 3.90 Volts. Then discharge the cell at a low rate (approximately 500mA) until the cell is down to 3.30 Volts.(That's basically "empty".) Now, charge it back up all the way to 4.20 Volts at 500mA rate using the TP4056 again. Now your cell should be fine. Tip #3: If you rush this process, the overall capacity suffers. (i.e. A 3000mAh cell ends up at 2200mAh instead of 2800mAh because the first charge was too fast.) Tip#4: During the charging process, periodically check the cell temperature with your fingers or the back of your hand. It's ok to be slightly warm, however, if the cell is HOT, discontinue charging and recycle the cell. The cells used in cordless tools should never get super hot at only 500mA charge or discharge rate. (They are typically high current cells, capable of discharging at a 10A to 20A rate!) If one of these cells is getting hot at 500mA charge rate, then something is chemically wrong internally and it will never be a "good" cell again. Tip #5: If you have the ability to test internal resistance, you'd likely find that the Hot cell's internal resistance is probably higher than the spec sheet shows for a new cell. Sorry, not safe to use this cell if it's getting hot. I should point out that a high internal resistance doesn't ALWAYS lead to a hot cell during charging/discharging. As long as the cell's temperature is comparable to other, known good cells... you can continue to use it in other projects that don't require high discharge rates. (Cordless tools typically need high current cells. This is known as the "C" rating.) Tip #6: Another good test is the self-discharge rate of the cell. If the cell is losing voltage just sitting on a bench, you may find that the self-discharge rate is fairly high. That's another sign that this cell has been used "hard". If you don't have the specialty equipment to measure self-discharge, you can simply charge the cell up to 4.20Volts, set it aside on your bench, then write down the voltage of that cell once a day for about 2-3 weeks. If it drops from 4.20V down to 3.85V (or lower) in 3 weeks of sitting on a bench, it's because the cell has deteriorated internally and can never be fixed. The good news is you can still use the cell in other projects that don't depend on low self-discharge. For example: a solar light that charges the 18650 up to "full" everyday wouldn't even notice if you used a high self-discharging cell. Thanks for your videos. I really enjoy them!!!

[@77777771955]

Sorry buddy cannot believe you have gotten so many views on subject that is all over YT and it took you 15 minutes. Stay on vacation.

[@MyPlayHouse]

It has helped lot´s of people getting life back in to there Fluke meter's

[@Ahmed-gm8li]

Ahhhh 2nd

[@MyPlayHouse]

What Ahmed,, 2nd,, you are slanging off :-)

[@teamaztecas763]

A very confusing explanation and a waste of my time

[@MyPlayHouse]

if you say so.