put our Heads Together
Join Date: Jun 2003
Location: southeast pennsylvania
Bikes: a mountain bike with a cargo box on the back and aero bars on the front. an old well-worn dahon folding bike
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Both of the charging methods you describe are possible, and both of them are inefficient. Carrying one battery to charge another battery is almost never a good idea because a lot of energy is lost in the charge/discharge process and you could probably buy more SLA-battery capacity instead.