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I can personally vouch for the K2 lifepo4 cells that they can push an insane amount of current but I haven't bought a good internal resistance meter. Of course LiFePO4 can't charge nearly as fast, but you can also fit more Amps and Ah in a smaller space and weight. Then again, building 26650...

As for cylindrical cells, battery hookup has the 3800 mah k2 energy cells at $220 for a box of 120. Each cell can do 27a continuous

The best deal on LTOs right now is the 22ah pouch cells on aliexpress from shenzen foxell. 60 cells for $920.