The i2 should be the 26650 cells. There are videos done on taking apart the battery case so you can see whats inside. You would just need to know how to weld nickle strips to the replacement batteries (heavy gauge wire and a modded transformer). The battery enthusiast forums/websites might be even more helpful.
I don't think the voltages are that big a deal. Just work on a bench so you can run or fall away from the circuit.
Isn't Tesla making a big deal out of them starting up a 26650 cell manufacturing line?
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