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This is my ebike

I have a multimeter, but I don't have that much technical knowledge.

Thank you for answer .Is it possible to repair the controller?

Hello. i have 350 watt 48 volt china ebike. When I put my battery in the bike, the battery indicator shows on the screen and the engine starts. But after 5-10 minutes the voltage drops and the indicator goes down to zero. First I thought the battery was exhausted and I bought a new one. The same...