How To Test Salvaged 18650 Cells - From Laptop Batteries

In this episode I will show you how I salvage and test 18650 lithium-ion cells. All these batteries are taken from broken laptops, so the batteries should still have some good capacity left.
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[@bilgekulkadirhan5258]

1:06 "this is a capitalist world feature" XD XD XD

[@MaximGhost]

Yes, but gopniks will defeat this feature every time.

[@pwolffilms]

This was really useful, thanks a lot for your time to making and sharing it with us!

[@f.d.6667]

Great video! I discovered saving 18650 cells only recently and it's a great way to save a LOT of money!

[@hemshi769]

I harvested laptop battery it was 3.7-3.6 v but many dint have anything left in it not even 100 mah. Yes we need to test them charge and discharge and check volt ,Very useful information sir.

[@DavidBeukes]

Great info, thank you Sorin.

[@farhadrahman1658]

Sorin, This video is very helpful. Thanks a lot dear.

[@Adanos_ger]

This deserves more than just a single thumbs up, lovely work there, thank you

[@johnaraydimaunahan7914]

Great Info! Thanks and more power

[@faizannabi7540]

Capitalist world feature good one ;D

[@jcmecatronica]

Fantastic vídeo. Best out there...

[@noname54]

Can you create a video on why its bad to have cells with different capacities in parallel and also how to be safe when connecting cells and cells groups.

[@sonnyeriksson3050]

I agree!

[@electronic7979]

Useful video 👍 Excellent 👍

[@oyeinlayifagoodtalk1639]

Thanks for this video.

[@billiobobski]

One little blow against the Capitalist World thanks to you Sorin! I will be back in the shed today breaking open those laptop batteries that have been sitting there all during 2021. And maybe my ebike will finally get its new 36v battery.

[@Sorin_DIY]

laptop batteries are not good for ebike. it needs high drain cells. but you can use them for something else.

[@taimoorkhan90]

Very nice sir

[@OlympusHeavyCavalry]

Interesting, Cheers bud :-)

[@ToolDroidGaming]

That was a funny ad😂

[@justw4lkbesideme]

Thx

[@TaylorSoloaiJR]

TOSHIBA seems to be the worst brand for me to salvage batteries, they are always less than 1Ah on each cell when i test them. Even though the voltage was good when I got them. LENOVO seems to have good cells.

[@anunyvape7808]

Thank you bro but i have a lot off old laptop battreys Can I extract it And charging them in series use i max b6

[@amanprasad6221]

What is the type of thermocouple used in laptop batteries????

[@alexbaseer5010]

2:56 ohh battery li-ion battery charger

[@eone2345]

You have nice handwriting there Mr Sorin

[@PhG1961]

Great video ! Btw, do you have a link for the battery tester/charger (Opus BT-C3100) you use in the video.

[@haydenc2742]

Google..they are all over the place There is even a 3D printable mod on thingiverse to add larger fans for better cooling

[@Sorin_DIY]

www.banggood.com/Opus-BT-C3100-V2_2-4Slots-LCD-Display-Smart-Intelligent-Universal-Battery-Charger-p-1183072.html?rmmds=search&ID=47184&cur_warehouse=CN

[@PhG1961]

Thnxs ! I have a SkyRC MC3000, but sometimes... I have my doubts about the accuracy.

[@cojanmihai5543]

Salut sorin . Îmi place treabă făcută de tine. Ai folosit imax B6 sc? Ce părere ai despre el? Mersi

[@Sorin_DIY]

salut. l-am folosit de cateva ori si e ok. pentru proiectele mele folosesc mai des module BMS pentru a incarca acumulatori inseriati.

[@maryws85]

Salut, Sorin! De unde faci rost de acele laptopuri? Aparatul acela masoara capacitatea reala a unei baterii? Mulțumesc!

[@Sorin_DIY]

salut. cateodata, cand am timp (acum nu prea mai am), ma ocup si cu reparatii diverse aparate electronice inclusiv laptopuri (ce se poate repara mai usor) - inlocuire displayuri sau alte componente, curatare de praf, schimbare pasta termoconductoare, coolere, mufe/conectori. mi-au ramas unele laptopuri care nu se mai pot repara, am cumparat/primit alte laptopuri incomplete/defecte pentru piese de schimb. in final mi-au ramas multe baterii de laptop, cu care voi face acum clipuri pe KZbin. iar cu acel incarcator Opus se poate masura capacitatea reala a unui acumulator.

[@alexandrumihaiologu4539]

Can you make a passive ground loop insolator for diy portable speakers?

[@Sorin_DIY]

hi. yes I can make one, but I think the sound quality is better if I use a dc-dc isolated converter. I will try both methods in future videos.

[@jcmecatronica]

Great

[@yoshibros1111]

Hey Sorin can you make a video about how to make projects with 18650 cells like the previous one where you were using AA batteries?

[@Sorin_DIY]

hi. I will use 18650 cells in future projects. but they will be more complex than this video.

[@yoshibros1111]

Thank you

[@Boz1211111]

Very good information in apropriate amount of time. just dissasembled a pack today and i was too lazy to test anything other than internal resistance, and built it in another pack, voltage was exactly the same and internal resistance 142-135mR. seemed in very good condition to me, but since i was not charging them slowly im little worried. in pack they are assebled now they will be charged at 1.2A, is that okay and will keeping an eye on them when i charge them first time be enough?

[@Sorin_DIY]

hi. what kind of battery pack? in parallel or in series? it's better to test their real capacity before you connect them. if one of the cells have a low capacity or a fast self discharge rate it will affect the entire pack.

[@Boz1211111]

@@Sorin_DIY 3s2p

[@Boz1211111]

Everything is okay, one pair is 0.01v higher after finished charge cycle. cheers

[@Sorin_DIY]

then it's ok to charge them with 1.2A.

[@ErkanOkman]

👍👏

[@carlos0celis]

Hii!! Should a I check voltage right after I charged the batteries? I have and. It doesn't show the full 4.2 volt, something between 4 and 4.18, those numbers are right after charging the battery. I am a little. It confused, hope you are able to clear things up

[@Sorin_DIY]

hi. if you check the voltage right after you charge the cell, it should measure between 4.1 and 4.2V. I think your cell cannot hold its charge too long. it was probably overcharge or over discharge once. you should mark the voltage on the cells, store them for 2 weeks and then measure them again and check the voltage drop for each cell. if the voltage is bellow 3.9V, I don't think you can trust those cells.

[@cggnow]

I am a tech but in computer hardware, not electricity. I have been thinking about building a "portable" PC so I can have some of the portability of a laptop but the horsepower and upgradability of a PC. Is it feasible to create an 18650 cell power bank to power a PC or would it just be too heavy to carry at that point? I would like to get at least an hour run time, more if possible.

[@Sorin_DIY]

hi. it' doable, but I don't think it's practical. the PC needs 3 supply voltages (3.3V, 5V and 12V) with a lot of current. for each conversion you will lose a lot of current, because the efficiency will be between 70% and 90%. the only option in my opinion, is to find a small PC (like those lenovo small office PCs) with a single voltage external power adapter. upgrade it with a better CPU, if the motherboard supports it, more RAM memory, SSD, bluetooth module... and use it with a portable DIY battery, instead of it's power adapter.

[@milvolts1]

Hello, I am hoping you could help me with this question. I made 3-24p 18650 battery packs, wired them in series to get 12v @ 60 ahs and added a 100amp BMS. Can I make a pack just like the one I mentions to acquire 120ahs? Thank you for your feed back. Have a nice day.

[@Sorin_DIY]

hi. do you mean you want to make 2 identical battery packs and connect them in parallel, to have 12.6V at 120A and charge both of them with one charger? theoretically it should work, but I never tried it.

[@milvolts1]

Sorin, thank you for your feedback. It would go something like this. And hoping for it to be possible: 3 packs of 24p wired in series=12v@ 60ah(1-BMS 100amp) and another, 3 packs of 24p wired in series=12v@ 60ah(1-BMS 100amp) Hooked up together in parallel for 120ah 12volts. And ideally to have one 12.6 @ 5 amp charger and or Solar panels do the charging. Do you think its possible. Thanks and keep your great videos coming. I actually bought all the parts you recommended for that power supply video where you waited for "the cat to pass" that was hilarious. Just haven't had time. I've been dedicating my time to building some solar power banks.

[@Sorin_DIY]

I think it will work, I don't see any problem. but I've never tried something with that amount of current. I suggest you use fuses on all connections.

[@milvolts1]

Sorin, yes I will be using an ANL fuse, a circuit breaker and fuse block for all connections including one for solar charging. Your input among others has been very important in my persuit of building this project. Thanks and keep on doing what you do. You truly are a special DIY'er

[@robertnitschke89]

so what? where did you get them ?

[@carrickmchwain2296]

Hi, I'm hoping you are still reading your comments. It is hard to get updated information on lithiums these days. I have a couple of questions I hope you can help me with. 1) I have an old HP laptop battery. It was completely drained when I left it on the shelf for 3 years. I used it previously for 4, so it is 7 years. I checked the voltage it is 6 cell 18650, 2 each. So 1 parallel cell is dead, but the other 2 are showing around 4V. Can these cells be recharged? 2) My current battery voltage is 4.18V, 4.06V, and 4.03V. Why is the 1st set so high? I was under the impression that lithium batteries lose voltage as they age, not gain? This battery currently only gives me 55% b/c it laptop won't charge if the voltage is above 12.55. Thanks!

[@Sorin_DIY]

hi. if some of the cells have over 4V, they are good cells, you can still use them. it is a bit strange that they can hold the charge for so long. if one of the pairs of cells got discharged, most likely one of the 2 cells has a problem and it is unable to hold the charge. it also damaged the other cell. if you still want to use these cells to power the laptop, you can remove all of them, then solder back only 3 good cells in series. it should work with half the capacity.

[@carrickmchwain2296]

@@Sorin_DIY Thank you, sir! I think it is not worth it if I can only get 50% capacity. I think I'll just replace it. Thanks again!

[@ELECTRONICS_EVERYTHING]

Hii sir i have some CGR18650CG batteries from old laptop battery pack.when i am charging these batteries all are getting too hot after 15 to 20 minutes then the battreis are damaged ?i am using tp4056 charging module to charge the battreis please answer the batteries are damaged or what the other fault ?

[@Sorin_DIY]

hi. old laptop cells should be charged with a lower current. the cells will be damaged if they get hot. you should modify the TP4056 module to decrease the charging current from 1A to 0.5A.

[@ELECTRONICS_EVERYTHING]

@@Sorin_DIY can you please make a video on modification of tp4056 module 😄

[@Sorin_DIY]

I already modified TP4056 modules in some of my older videos and also on my patreon videos.

[@ELECTRONICS_EVERYTHING]

@@Sorin_DIY ok thanks sir i will watch those videos😄.

[@MyName-pn6td]

Just wondering, is it save to use revived overdischarge battery? Cause lots of people doing it

[@Sorin_DIY]

hi. if they are good quality cells and have been cared for most of the time and only once got over discharged, the cells can probably be revived. but the cells must be tested - capacity, temperature, self discharge rate. cheap/low quality cells can be dangerous if over discharged.

[@MyName-pn6td]

@@Sorin_DIY thank you so much, i've been searching for the answer and they only say don't do it without giving any reason why

[@noeliamendez9788]

I want to fix mine is a dell studio 1555. How do I know which cells will work? Do all laptops have this kind of cells?

[@Sorin_DIY]

hi. most laptop batteries have 18650 cells. slim laptops have other type of slim cells. but it's cheaper to buy a new laptop battery, instead of individual cells and replace them. you can't replace only one cell from the laptop battery. in a battery pack, all cells must be the same model, same capacity, same life span, same charging cycles.

[@user-cs2hj4ls7g]

What will happen if you put different capacities batteries in one pack??

[@waltercomunello121]

So to recap: 0 < voltage < 1V5 => most likely dead or pretty much useless, throw them away 1V5 < voltage < 2V5 => might be revived with some low-current charging for a long time voltage > 2V5 => go ahead and charge them with standard values With appropriate charger. is this correct?

[@Sorin_DIY]

yes. we can add one thing: if the cell has less than 1.5V, in some cases it can be revived, if it's a good quality cell. but the capacity will definitely be affected. usually it will self discharge very fast.

[@waltercomunello121]

@@Sorin_DIY thanks for your answer! I managed to salvage all 11 Lithium ion cells I had with a Zanflare C2 but I'm still in the process of trying to understand the basics of cells and I'm looking for a suitable way to test Li-Ion capacity with some DIY solution, just to make some practice :) All of them seem to behave properly until now, still doing some charge retention tests. Charged them fully, stored in a cool place, in a couple days I'll check their voltage.

[@Boz1211111]

i sincerely hope they end up in recycling bin for batteries tho

[@steffenalber8297]

After they have been laying for 8-16 days. Shall they be charge again before the capacity test?

[@Sorin_DIY]

first check the voltage, if it's too low, you should not use that cell. then you can test their capacity, without charging them. this way you will know which of the cells have the lowest self-discharge rate.

[@steffenalber8297]

Thx. I have charged my cells, and let them test for 9 days. All there are over 4v, I will capacity test. Would you mean it's okay for the cells there are minimum 4,00 v, and the rest out for thrash

[@Sorin_DIY]

you can probably still use some of the other cells too, but they will have a smaller capacity and will self discharge faster.

[@steffenalber8297]

@@Sorin_DIY thanks very much for your help. And a great job with your channel. It's very informative and good help. I am building a battery pack for my diy bluetooth speaker.

[@samsharma8621]

At the first place how do you ended up getting so many laptops

[@Sorin_DIY]

hi. before I started to make videos on KZbin, I used to repair electronic devices in the spare time, even laptops. replacing displays and other components, soldering connectors, cleaning them and replacing the thermal paste. some laptops cannot be repaired anymore, other I just bought them incomplete, but very cheap for spare parts (or they were donated). so I ended up with a lot of laptop batteries.

[@netanelhacohen1786]

Opus btc 3100

[@ryantalampas3870]

I have 18650 the voltage is around 2.0V to 2.6V will be revive?

[@Sorin_DIY]

yes, if it's a good brand cell.

[@ryantalampas3870]

Toshiba i think it Panasonic made in japan

[@ilhomjonmatjokubow7746]

Can you link such a battery tester

[@Sorin_DIY]

hi. are you referring to the Opus charger? www.aliexpress.com/item/2015-BT-C3100-V2-1-Digital-Intelligent-4-Slot-LCD-US-Plug-Battery-Charger-Compatible-with/32333901154.html?spm=2114.search0104.3.14.6e7c5c66oQIDrs&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_319_317_10696_10084_453_454_10083_10618_10304_10307_10820_10821_10301_538_537_536_10059_10884_10887_100031_321_322_10103,searchweb201603_53,ppcSwitch_0&algo_expid=c91e201a-eb81-4106-a39c-b99f3c8a057d-2&algo_pvid=c91e201a-eb81-4106-a39c-b99f3c8a057d&transAbTest=ae803_3

[@gabrielantiligando9905]

I dont like salvaging used batteries cuz i dont have something that will check it health and i dont know if its fine or not. Nice video tho

[@mrmemoo4483]

if i let battery for 3 years and test it it will be ok if read more than 2.5 v?? that mean good battery never goes under that?

[@Sorin_DIY]

the voltage should not get that low. but if it's at least 2.5V it should still work. but if you haven't use the cells for 3 years, you should test the cells (capacity, temperature, voltage) before using them.

[@mrmemoo4483]

@@Sorin_DIY ok if i use a good battery then i discharge it in device ok? until it goes low then it will reach 2.5 volt or less??

[@Sorin_DIY]

you need a protection board for the lithium cell so the voltage will not decrease lower than 2.5V

[@mrmemoo4483]

@@Sorin_DIY what??? please read my question well

[@inso5078]

What did you mean by "hot"? I mean, if my batteries get quite warm, but not hot is that the hotness you were taking about? :D

[@Sorin_DIY]

hi. it is not a problem if the cell warms up a bit, in fact in some cases it is inevitable. in my opinion it's recommended to charge and discharge the cells at a maximum rate of 0.5C (preferably 0.3C). this will warm up the cells just a bit. if you use 1C rate, the cells will get hot. in time this may decrease the cell capacity. and if you use a rate bigger than 1C, the cells will get very hot and it will definitely damage the cells in time.

[@inso5078]

@@Sorin_DIYThanks for the answer! I noticed that older cells, even when not at 0V get significantly warmer than those found at about 3V. I have one more question if you don't mind. I have a Liitokala Lii-500 charger and it tends to sometimes overcharge the cells to 4.21-4.22. although it usually falls to normal levels after a day, I wonder if this kind of slight overcharge is dangerous for the cells? I've been searching for the answer, but all I know is some cells have 0.05V tolerance.

[@Sorin_DIY]

charging the cell to 4.22V should not damage the cell. TP4056 modules sometimes charge the cells to 4.24V and I use them a lot. the cells are a bit stressed, but I don't see any permanent damage immediately. it may probably decrease the cell lifespan but insignificant, probably with less than 1%. it also depend on the quality of the cell. some BMS boards have the overcharge protection at 4.35V, this will definitely damage the cells in time.

[@ahsanwho9739]

when is your next video coming

[@Sorin_DIY]

in 2 weeks I think.

[@ahsanwho9739]

thanks for like by the way i like your bluetooth speaker and i have orderd the components for that i made one with pam804 and it was good

[@dodi8635]

de unde ai facut rost de laptop gratis?

[@Sorin_DIY]

salut. unele laptopuri mi-au fost donate de cunostinte, pe altele le-am cumparat foarte ieftin din targ pentru piese.

[@ugenegareth9339]

I answered and said, "If I have found favor in thy sight, O Lord, show this also to thy servant: whether after death, as soon as every one of us yields up his soul, we shall be kept in rest until those times come when thou wilt renew the creation, or whether we shall be tormented at once?" 76 He answered me and said, "I will show you that also, but do not be associated with those who have shown scorn, nor number yourself among those who are tormented. 77 For you have a treasure of works laid up with the Most High; but it will not be shown to you until the last times. 78 Now, concerning death, the teaching is: When the decisive decree has gone forth from the Most High that a man shall die, as the spirit leaves the body to return again to him who gave it, first of all it adores the glory of the Most High. 79 And if it is one of those who have shown scorn and have not kept the way of the Most High, and who have despised his law, and who have hated those who fear the Most High -- 80 such spirits shall not enter into habitations, but shall immediately wander about in torments, ever grieving and sad, in seven ways. 81 The first way, because they have scorned the law of the Most High. 82 The second way, because they cannot now make a good repentance that they may live. 83 The third way, they shall see the reward laid up for those who have trusted the covenants of the Most High. 84 The fourth way, they shall consider the torment laid up for themselves in the last days. 85 The fifth way, they shall see how the habitations of the others are guarded by angels in profound quiet. 86 The sixth way, they shall see how some of them will pass over into torments. 87 The seventh way, which is worse than all the ways that have been mentioned, because they shall utterly waste away in confusion and be consumed with shame, and shall wither with fear at seeing the glory of the Most High before whom they sinned while they were alive, and before whom they are to be judged in the last times. 88 "Now this is the order of those who have kept the ways of the Most High, when they shall be separated from their mortal body. 89 During the time that they lived in it, they laboriously served the Most High, and withstood danger every hour, that they might keep the law of the Lawgiver perfectly. 90 Therefore this is the teaching concerning them: 91 First of all, they shall see with great joy the glory of him who receives them, for they shall have rest in seven orders. 92 The first order, because they have striven with great effort to overcome the evil thought which was formed with them, that it might not lead them astray from life into death. 93 The second order, because they see the perplexity in which the souls of the unrighteous wander, and the punishment that awaits them. 94 The third order, they see the witness which he who formed them bears concerning them, that while they were alive they kept the law which was given them in trust. 95 The fourth order, they understand the rest which they now enjoy, being gathered into their chambers and guarded by angels in profound quiet, and the glory which awaits them in the last days. 96 The fifth order, they rejoice that they have now escaped what is corruptible, and shall inherit what is to come; and besides they see the straits and toil from which they have been delivered, and the spacious liberty which they are to receive and enjoy in immortality. 97 The sixth order, when it is shown to them how their face is to shine like the sun, and how they are to be made like the light of the stars, being incorruptible from then on. 98 The seventh order, which is greater than all that have been mentioned, because they shall rejoice with boldness, and shall be confident without confusion, and shall be glad without fear, for they hasten to behold the face of him whom they served in life and from whom they are to receive their reward when glorified. 99 This is the order of the souls of the righteous, as henceforth is announced; and the aforesaid are the ways of torment which those who would not give heed shall suffer hereafter." 100 I answered and said, "Will time therefore be given to the souls, after they have been separated from the bodies, to see what you have described to me?" 101 He said to me, "They shall have freedom for seven days, so that during these seven days they may see the things of which you have been told, and afterwards they shall be gathered in their habitations." 102 I answered and said, "If I have found favor in thy sight, show further to me, thy servant, whether on the day of judgment the righteous will be able to intercede for the unrighteous or to entreat the Most High for them, 103 fathers for sons or sons for parents, brothers for brothers, relatives for their kinsmen, or friends for those who are most dear." 104 He answered me and said, "Since you have found favor in my sight, I will show you this also. The day of judgment is decisive and displays to all the seal of truth. Just as now a father does not send his son, or a son his father, or a master his servant, or a friend his dearest friend, to be ill or sleep or eat or be healed in his stead, 105 so no one shall ever pray for another on that day, neither shall any one lay a burden on another; for then every one shall bear his own righteousness and unrighteousness." .....2 Esdras 7:75 ////////////////

[@kacpreusz9911]

1:06 #apple

[@adamkwalczyk]

This is capitalist world frature 😅😂

[@f.d.6667]

"This is a capitalist world feature" ... true! EU-version *"Your almost new battery has now been disabled to protect the climate! - Please by a new one at a higher price AND with an extra carbon tax."*

[@randydicotti3975]

The problem is solved in a Socialist world....no one can afford any batteries.

[@mpacemedia4317]

When checking the batteries with meter, test the individual cells lol dont test when they are still connected. When you tested them in the video 1:55 you were not testing the individual cells.

[@user-vm1kl8ey9p]

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