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The battery is the most expensive part unless you buy a higher end bike to begin with. Imagine my discomfort when my first $850 battery came bad on arrival. It would trip the built in BMS with only about a 2 amp draw. Thankfully after a lot of back and forth Luna cycle did take it back and refund the money including all shipping. They just couldn't believe the battery was the problem and had me test every other part first including sending me a new controller to try. Add to that the shipping restrictions on big Li-on batteries and it was hard just to get fedex to take it, definitely a PITA. So buy from a company that will make things right, had I gotten that directly form China I would have been up a creek although I think I could have fixed it with a new $100 BMS.
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