I abandoned the water bottle concept for the battery holder and decided that a detachable bag on the back and a single charger would be better for what I do. I went from a 12ah to a 30ah battery, so I am able to charge it once and bike over 80km with out needing to charge it.
It may seem like overkill for my use but I never have to wonder if the battery will die on me. After 80km I still had more than 50% available.
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