The recommend discharge is 3,6V, but they can be drained to 2.5V….
The best way is lii-500, there you will comprove the capacity in nor test and will know if worth to use or not, and the really matters if you are use then in series, select the “capacity matches” for do not over discharge one.
As Monty Python would put it: You lucky bastard ! 
I see 3 green ones resembling Sony.
Might be high drain cells.
For storage it’s best to charge them up to approximately 3.6 Volts.
Given the number of cells that you already have and the clear opportunity for a continuous stream of ‘new’ ones, you can afford to be pretty picky about which ones to keep. I set my pass/fail at 3vDC, if they are below that when they come out of the pack, they get recycled. Now that I have my Lii-500 analyzing charger, I ran them through a NORmal test to see what the capacity is. I recycle anything that tests at less that 1000 mAH. HKJ is not confident in the IR test of the Lii-500 so my next job is to make a tester to get an accurate number for that.
I created a Google Spreadsheet to keep track of all my batteries. When I pull them out of a pack, I sharpie marker a ‘serial’ number on them. In fact, when I buy new cells I do the same, Lap Top pulls get marked LTxxByy, purchased batteries get initials of the supplier. BGyy - BangGood, GByy -GearBest, MTNyy and so on.
Charging them to a storage voltage rather than full up may be best practice, I have mine at full capacity since I don’t want to have to add -“Charge all my batteries” to the list of stuff to do before Hurricane Mathew (or whatever) takes a swipe at us.
Well before you get too carried away……read a few laptop pull threads here on blf …use the search feature … Some advice here would have saved you a few scars … i also suggest NOT cleaning up all the cells …certainly not before basic testing ….i woulpdnt suggest a discharge test either just check their internal resistances and charge up tyhe best of the best of each pack ….Cleaning the ends up on cells you trash makes you feel really dumb . just get themripped apart and clean enough to get them safely in a charger .
FUN STUFF …I really get a kick out of laptop pulls it’s like crazy christmas …
Anything that doesn’t say lithium ion on the pack you don’t want …those big C size cells are lots of times Ni-cad and cadnium is nasty nasty and absolutely needs recycled . I probably wouldn’t have picked up lead acid / gel cell stuff either ….WHY ?
looks like you have some great cells ….i have lots of those lt blue /purple samsungs from some new unused oem packs … they can be charged up to 4,3 ? 4,35 V ? if you have the right charger . they are nice cells to gift to friends who have never used lithium ion before since immediately they can never over charge them with most regular chargers . 
You may want to double-check the chemistry on those cells before you throw them in the charger. I saw a Dewalt pack in your first photo. I had torn down a Dewalt lithium pack and found the cells were the 3.2V nom./3.6V full-charge LiFePO4 chemistry:
In lieu of a chrgaer that tests cells you can just charge them up /record voltage fresh off the charger and them look at the voltage every couple days or so for a few weeks …bad cells show their true colors pretty quickly and with a large pool of batteries you’ll be able to see good from bad ….OTTOH these chargers these days are exceptional // do multiple chemistry charging and lots of testing all for cheap …what a deal 
Those dark green cells that appear to be slightly slimmer and longer may be Ni-MH (Hard to tell in picture). If they are they should be high drain 4Ah cells. They will measure 17mm x 67mm. They will also be LSD if they are what they appear to be.
Hey thanks guys for all the input and suggestions, keep em coming. Consider me an infant on this subject matter. I have just recently started dabbling in the LED scene. It started asking about flounder lights. I’ve placed 3 orders through fast tech and as you can imagine I haven’t gotten anything in yet. I’ve bought a soldering iron, solder, and a bunch of various electrical tools. I’m going to build the flounder lights first, then onto flashlight mods! I love flashlights, just never thought of building them. I love free swag even more so I’ll continue to get free cells, just can’t help myself.
I could’ve have been more careful ripping the packs and will from now on, I tore the wrappers on quite a few and will have to re wrap them once I test them.
As far as cleaning the cells, I caught myself cleaning them as I was ripping the packs apart and about half way through stopped my self and figured I’d test them all first.
I am only keeping the 18650s those lead batteries are all in good working condition, so I can and will use those. I currently use them for flounder lights and so does a bunch of my fishing buddies. They will get used for sure.
Do any retail stores in the US sell those battery charger/testers? Ordering online is not a problem it just takes a while to ship.
I agree with being picky about what cells to keep. If I can get a steady stream of cells I’ll surely get picky. Right now I don’t know what good cells are so I’m not picky!
Thanks again!! You guys have created a monster! Lol
as stated earlier many of these are going to be in good shape due to it beirn time to do a scheduled replacement.
i would keep the c nicads/nimh too.
good for c maglight hotwire mods.
lucky find.
i got some 6 month old medical packs with sanyo 10h d nimh recently.exceeded shelf life.my friend will get every battery they need rid of now.
he is into solar like me so with my testing gear we will both win.
+1
best bang (i know im gonna hear about it) for the buck (pun intended)
Nice going ‘ChadB’… looks like you found an endless supply to pull from. Congrats………
Oh yeah, like has already been said, the LiitoKala Lii 500 charger is decently priced and does a good job.
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Pulled these today, notice I didn’t rip the heat shrink all up! LOL, I’m learning… All of these batteries in the photo were perfect, they tested on the volt meter from 3.68v to 4v averaged around 3.85v… Only 3 of the packs had cells that were bad or I didn’t want! some Ni-hm’s in one pack, bad cells in one, and then bad cells that were “C” sized lithium ion batteries.
I think I’m done for a while, I’ll let the supply build back up and make a day out of it!
ALSO is there a battery charger/tester comparable in price and functionality to the LiitoKala Lii 500 sold in retail stores or online that ships from the US?
I am going to order a LiitoKala Lii 500 but would like to find one now being it take a long time for orders to get here from China.
Plus with all these damn batteries a couple chargers wouldn’t hurt.
Thanks for everyones help, after I test these I’ll post results…
Wow…… I am jealous ChadB.
Those look great!!!
Teach, your close enough to me…… Let me get these things tested and one day if you’re around my side of town hit me up and you’re welcome to have some!
I work very close to I10, PM me and I can give ya my #… I’ll trade ya batteries for advice!
That sounds like a plan ChadB!
Are you in P’cola or close? If so we are practically neighbors. 
I’ll PM you in a minute my friend……
What a beautiful sight!! You can never have too many batteries. You can even sell them on the forum.
You might consider numbering them so you can keep track of them. There are a couple discussions around here where folks talk about battery organization.
As far as chargers go, have you seen this topic: ” chargers for a $1”:DIY: Olight Magnetic USB Charger Make Your Own for $1. Tutorial Video
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Thanks for the 1$ charger tip! I need a tester. I have a cheap charger.
In case it hasn’t been mentioned yet, just keep in mind that some laptop batteries are the higher voltage versions (max charge of 4.35v, not 4.2v). So, the resting voltages will be a bit higher on those than the standard 3.6v/3.7v cells. If you web-search the model number printed on the sides, you should be able to tell which are which. 