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I have one of these bikes. It has a 24v brushed motor and 2 stage planetary gears, IIRC the gears had 'pihsiang' moulded in to the gears so they are custom. I converted mine to a standard 24v Li-ion because the batteries had leaked inside the box and destroyed the BMS You could try the...

I have a Sunrunner ebike that I got as non-working/dead battery. I hooked it up to 21.8v and it operates the motor at low speed on the throttle, at 25.4v it went a little faster. This is with no load (wheel in the air) and running from nimh AAs just to test if it's worth spending more money on...