Co-worker was going to recycle a laptop and jokingly asked me if I wanted it. I said, you know what, I’ll take just the battery pack.
Brought it home and did a lot of prying to find six Samsung ICR18650 30B. Put the DMM on them and they read:
4.12V
4.12V
4.12V
4.12V
4.13V
4.13V
Not bad for a first attempt, I think.
Good for you!
Those are really nice cells!
nice!
Nice
I will need to open up some battery packs to, they are just laying in the attic
Thanks guys. Funny yesterday I posted that all my 18650 batteries are 4.35V on another thread. I only had 2. Now I have 8, and they are still all 4.35V cells.
Maybe it’s time I bite the bullet and get that 4.35V-capable charger.
Well done ….
you don’t need to worry about over charging them thats the best thing about 4,35v cells If you’re worried about giving someone lithium ion for the first time at least you can check off that box .
chicken dinner !
In my experience, having an average of 4.12v resting voltages out of the pack is not yet a reason to celebrate… better to charge each individually while monitoring excessive heating (throw away if they are), then go through the process of a discharge test to determine actual capacity left.
I once opened a pack with Sanyo cells that had similar resting voltages, only to find out later that they had lived a heavy life and already heats up abnormally when charged.
Thanks for the cautionary tale. So far I’ve put each of them in my Astrolux S1 and cycle them through the modes for a minute or so, none got warm. I know, not long enough to tell. I just wanted to make sure they worked.
I’ll have to watch out for excessive heating and diminished capacity when I get around to charging them. Thanks again.
Nice find…!!!
Gota luv harvesting 18650. For me, its not so much the money, its kind of like a treasure hunt…
I did about the same thing a month or so ago. not as lucky as you though not nearly as lucky…
How do you know/determine if they are 4.35v cells…?
Did 2 old broke laptops from in my garage. 1 laptop probably spent 5 summers at 100°+, the other at least a few. The volts on the 6 sammy were down to 2.6, the 8 green ones were close to 2.0v. I know, should of thrown them away. But instead, I got a lii500 and decided to carefully see what I got.
Only got 6 samy 2000, and not sure exactly what these 8 green ones are, but they seem to be all good.
The blue samy on my lii500 take1980-2022 mh. And seem to hold a 4.20v charge perfectly, for weeks now. The green ones only charge up to 4.18-4.19v but also are holding the charge for weeks and take 1800-1850mh, neither get hot when charging at 1000mh. Both the green and blues work great in all my lights. Not to sure what the is the meaning of the resistance measurement the lii500 gives. They are all under 90mr, oldest green ones all come in at around 34mr…, whatever that means…? What is the correct way to determine if a battery is good/bad/dangerous…?
On a side note, the ultrafire batteries that came with some of the ebay cheapy lights aren’t worth a $hit. One of the ultrafire cells only takes 298mh, the best one takes 855mh, what a joke those ultrafire are.
Trying to figure out how to get more recycled battery packs…? Looking for some of those sammy 3000 you got, you’re a lucky dude, hit the jackpot…
Since this was my first harvest was a little brutal on those paks and nicked up a few batteries covers, so did a little heat shrink jobby…
I googled the specs on them and that’s what multiple sources said - 4.35V.
Yeah same thing, wrappers torn up and nicked. But I don’t feel too bad since I didn’t buy them 
if you know what the laptop was or the model number on the battery pack make sure and add it to the big blf laptop battery pull thread ;
BLF Community Battery Pulls Overview Thread
I’ll need to do that. These seem like good cells. I charged them up to 4.2V and they have been holding up. Perhaps the fact that, being 4.35V cells, they were not charged to 100% allow them to hold voltage so well.
I did another pull and got red Sanyo 2600mah 4.2V cells. All 6 were at 3.85V and I charged them up to 4.2V. After a couple of days, they are holding at 4.19V.
Now I have 3 18650 devices and 14 batteries. What else can I use these batteries in?
My vote goes to the Xtar VP2. Great little charger.
Nice find on the cells!
The answer to this is simple. You need to buy 11 different flashlights that use 18650 batteries. 
What about the flashlights instead of using just one 18650 , they use x2 , x3 , and x4 18650 batteries at a time ?
How simple is that to figure out ? :person_facepalming: 
I think I’ll use some for powerbanks, save a few for the upcoming Q8 SRK style light.
Maybe I’ll start vaping too
Just keep in mind those cells (30B) are rated at just shy of 6A for max continuous discharge. So, probably not the best choice for any “high drain” device. 