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Originally Posted by BrianG
Hmmm. Well, I wanted less weight than NiMH, about half actually. Maybe I will wait until the A123 Systems M1 cells come out in the DeWalt unit. But those are only 2.2Ah according to that link I posted earlier. Again, I could go with 4s2p or 5s2p, but then weight goes up again. Looks like Li-Ion is not in my future after all. And I definitely don't want Lipos. Unless maybe something like this (one of each)? |
Well, there is a penalty for having a more robust metal case around the compounds of the cell. The only way you're going to get half the weight of NiMh with a setup that will perform well enough is to go Lipo. Like squee asked, why not Lipo? I've got 5 Lipo packs sitting right next to me right now, with another on the way. Although I have gone through a few (older) packs, I have yet to have any smoke, let alone fire.
EDIT: Just saw your post. There is always the possibility for a Lipo failure, but there is the same possibility with NiMh, except that it is lessened with NiMh (and they have vents on them). Life cycles on Lipos depend on so many things that you can't judge them - abuse/mischarge/misdischarge/maintenance/brand/etc.
Ask coolhand about LiMn, he runs them.