Thank you everyone for your replies.
Yeah, on that one I was doing it for FMcamaroZ28's pack, since we knew what the final value of each cell should have been.
Just wanted to see if my math worked correctly for each cell.
Thank you for the help calculating gauss.
I knew what you meant, I will definitely look for markings like that. Thanks for that tip. 
Would a higher capacity battery, like an 85Wh, or 5200mAh mean higher capacity 18650s inside? (I even saw one that was like 104Wh.)
Probably, but not necessarily. It depends how many cells there are. I've only seen one 14.4V battery (4s), all the rest say 10.8 or 11.1V, which is 3s. Take the number of cells/3, or 4 for a 14.4V pack, and that's the 'p' number, the number of cells in parallel. divide the mAH rating of the battery by the 'p' number to get the individual cell's mAH rating.
I’m using two of these in my two laptops. I usually run them plugged into the mains and charging they are about 4 years old now. Do you think that they’d be worth stripping down when they eventually fail? I’ve still got the two original 6 cell packs with only about 3 weeks use on them then charged and stored, any good do you reckon. The new packs are £57 ~ $90 so I’m going to use these until they fail.
I’d like to think that I have a few cells for any emergency situation that might occur.
If you really want to dive into the deep end of the pool, you could start here: How to calculate battery run-time
Dim
+1
Only gas money.
If someone tries to sell you a dead battery pack, feel free to, as the saying goes “use whatever language you deem appropriate” and stop going there.
OT, with apologies.
I believe, and cannot prove, that what you are doing will extend the life of your packs and cells.
I have an Inspiron with 2 packs, and I always left one in the bag, one in the PC on the wire. I’d swap them when onsite and one ran down. I considered one as a “favorite”, but tried to keep them both topped off. I didn’t think about it until it was too late, but one of them died a lot sooner than the other.
If you could stand to kill one, maybe you could pick one to stay on the wire and the other to get deeply discharged and recharged as needed… That might answer some of the “dead pack” questions…
Just sayin…
PS: the individual cells should be in the 2200mAh range, which means they’re not all that exciting, but they’d certainly make lots of light for you.
Was in town earlier and stopped in at a PC repair place, he is going to see if he has any dead laptop batteries - but they might have just been chucked out. Going back tomorrow.
Got two chances I guess!
Got lucky today, clients laptop was stolen and he had a habit if using his laptop without battery installed, I ended up with 6 Sanyo cells that are 4V pulled , busy charging now before I do capacity tests.
48WH/11.1V=4.32AH
4.32AH/2=2.16AH
implies 2200mAH cells
and it's 3S2P.
Apparently my Low-Alcohol Warning Alarm isn’t working.
Thanks for the correction.
Right, I haven't seen 2150's yet so went with the closest size I've come across.
Believe it or not, I re-wrote that part something like seven or eight times, trying to come up with some unifying formula. I kept stumbling over second-order unknowns like the current draw and residual capacity at the low-voltage cutoff (and that nagging low-alcohol warning) … But that kept me from seeing all the other, more sensible posts.
Plus, it turns out, it’s hard to find a pack rated in “Wh”. The ads may say that, but the labels on the packs mostly seem to give V and mAh, which is much easier to compute. But why would any of that matter since I know I’ll get a different runtime out of my “xyz” cell than you will of yours, even from the same batch, just because we use them differently.
Then the magic mushrooms wore off and it dawned on me, the OP is probably just looking to buy a pack to rob, with the deepest cells in it, & needs a way to tell which is which. That’s the only thing that makes sense, with the “YMMV” rule in effect.
So, just to kick me and my dog :bigsmile: (just kidding), would you concur that, given the different rated pack voltages, wouldn’t the “plain” Wh ratings (or calculation) of packs serve to show which has the deepest cells?
I’m not sure it matters at all to me. As long as laptop packs die, I will continue to churn these freebies “with extreme prejudice”. But if a fellow had to buy the best pack available as a cell donor, it would be handy to have a way to pick the best.
…
Dim
Went back to the computer repair place today, didn’t exactly hit a gold mine but I did walk away with 1 6 cell Dell battery. A bit of butchery later, and I got 4 cells reading 4v, 1 reading 1v and 1 reading 0v.
They are grey LG cells.
I asked the owner to hold on to any laptop batteries he gets in, he didn’t seem to think they got many in but agreed all the same.
Beginners luck?
I was at the Lowes return desk today to return a lamp. That area is were the recycle bin is. I reached in and pulled out this. I only took the one, what am I a pig? 
Anyway here are the pics, no words are necessary. I am charging them up as I post this.
You need a bigger hammer!
Edit: “Fukushima”??? Them is NUKULAR Batteries!
(Seriously, nice find! Those US18650GR’s have been reviewed here. I have a batch & love ’em.)
No pain, no gain, dchomak?
Don't worry... with bleeding... the blood will always stop... one way or the other. 
Hope you didn't get hurt to badly.
Anyways: For your cells: 4400mAh, 6 cell, 2 parallels.
[(4,400mAh x 6cells) ÷ 2 parallels] ÷ 6cells = 2200mAh min capacity per cell (Actual min capacity 2291mAh per US18650GT's thread)
I got a New Dell cell origin Korea (Only korea cell: LG) Extended battery coming. Thinking it will yield 3000mAh Pink LGs. Will post once it arrives.
Does anyone have any info on which brands will come from a cell origin? Like LGs from Korea.
What comes from Japan?
You could say I’m on the “bleeding edge” of technology!
I hope everybody knows to keep some superglue (old-style runny liquid if you can find it anymore, instead of gel) on hand for when that happens. Works great. It sets almost instantly when it contacts blood. Dribble some down inside the cut, squeeze it closed, then get back to work.
I thought Samsung was Korean.
Wear gloves!
Samsung and LG are Korea
Panasonic , sanyo and sony are Japanese
Moli is canada and DLG is china
Almost every(New unused OEM) laptop pack I've torn apart have been pretty high end quality cells
used recycled laptop packs need to be viewed as a much riskier option
unless you have the right tools to assess the quality of the cells tou should assume they are much more dangerous than //new unused or protected.
obviously avoid all ultrafire /trustfire ...fire/fire batteries