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Hi,
As I understand it from the interview (see audio link in the SciFri link above) the basic battery chemistry is the same as any lithium iron phosphate battery (i.e. pretty darn good) and it is most likely better in terms of life span and number of recharges; for the same reasons that let it charge/discharge so quickly. It doesn't get nearly as hot since the surface area is so much greater, and the chemical storage is a lot more "capable".
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