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

what happen to the remaining 5%?

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

@@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.

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

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. :(

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

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

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.

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

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)

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

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

Hello .. how much does this charger cost ?

This is what NASA uses to inspect moon rocks. :D

hmm, i think lg he2 and sony vtc5 can be added to this

Chinese batteries are advertised to have 10000 mah lol

Or just use a proper current-limited power supply, rather than risk blowing things up if you do the calculations or wiring wrong.

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!

​@@test-193thank you!

@@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?

​@@test-193thank you,sir!

I first charge them to full then I use the "discharge" option. When it's done, it will show the capacity in mAh as you see in the video. I did not use the "discharge refresh" option.

vuaeco Thank you

Navagation lights around the ocean and railway crossings.

I want that answer too brother

That is a good question!

Me too

100% agree with this

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.

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

they are crocodile test cables

Use theory on li ion battery pack if your usp is using li ion. U need to understand this is a science that can be applied to many scenarios

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.

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

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