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One more geeky addition, as far as know Lithium Iron batteries are a whole different kettle of fish. For a start they should be pulse charged - short pulses of current. Also, they are pretty dangerous things. If it werent for the safety aspect Li-Ions would have an even higher capacity than they do, but because of their volatile nature they have to be made in such a way that they are safe by giving them pretty thick sturdy casing.
Ive heard a report of one of the early li-ions in a cell phone exploding and causing nasty injury to the users face.
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