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Really clever idea Lev, not sure whether you can charge off of the AC brick while the battery is under load but it's probably worth trying if you don't mind the weight penalty.

I don't have any wisdom to offer on the DIY front but I can tell you that I've gotten up to 85 miles on the factory battery in my Gain D30, riding about 90% of the time in Eco with occasional very short forays into the mid (orange) boost. I came in from my last ride of that length with what the...