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Been there, done that
I recently dismantled 70 some used lithium packs that were going to be thrown away and they were almost perfectly usable. The physical size is a 4/3 A. Digikey has plastic holders for them with terminals, I bought a dozen and I can look at the part number for you if you want. But if you just want a couple hundred cells to play around with they're sitting in a box in my house. I'd be perfectly willing to send them your way, just make me an offer. And I think they're all charged to boot.
For charging I use a Bantam BC8 with a harness I made myself. It charges and balances 8 cells at a time. Not ideal for you, but it does export the data to a computer so you can look at the charging curve.
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