I'm currently testing a couple lightweight prototype batteries in my motorcycle and my commuter car as potential candidates for replacing the 14 pound Braile in my Atom. Expected weight will be about 2.5 pounds.
1.5 pound (L) and 2 pound (R) batteries (14.5lb Odyssey PC680 in background).
So far it cranks fine in -8˚F weather, Cranks fine 100˚F weather. One year warranty, shelf life (no voltage drop) of about 2 years without a battery tender (assuming no electrical load sucking power). This is a LiFePO4 variety that has much nicer behavior to being punctured than lithium polymer type batteries that seem to catch fire and is pretty reasonably priced too. My commuter car has worked flawlessly for the last 7 months and I think I'm sold. I'll order a slightly bigger one for the Atom for a little extra padding when the time comes. It seems to be one of the most cost-effective ways to drop 12 pounds off the car.
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