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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first question to ask yourself is, have you established that the problem is the batteries rather than the motor or controller?
The fiddly electronic bits are often the culprit in an e-bike breakdown, so e-bike controllers are often the place that things go wrong.
If you have sealed lead acid batteries, one thing you can be thankful for is that they don't have any fiddly electronic bits. However, if you run them down to zero twice a day, 50 round-trip commutes might be about all your batteries can do. If you want them to last longer you'll need higher capacity batteries (so you don't run them down to zero) or else batteries that are not lead-acid.