In January 2022 I found a cheap ebike for sale locally and bought it! The catch was that it had no battery. The previous owner had recently moved in from South America and wasn't able to ship the ebike's lithium ion battery, just the bike iteself.
Bike Info
The bike appears to be Vindrais Revol-E, retailing for about $1800 US.
Battery Connector
The exsiting battery connector was snipped! This meant that even if I found an exact replacement battery, I'd have to do a bit of soldering to get the connections working again. I was curious at this point why there were two positive and two negative connections. My guess is that the middle two wires (the narrower ones) were for the headlight or the motor controller circuitry, while the outer, wider wires were for power delivery to the motor.
Controller
I googled around for what the control model might be:
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No results for LSW1540
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No results for X1911084884
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Plenty of results for CE-G3M20211!
- This looks like a similar product
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Power connectors look like bullet connectors, but I'm not sure what size
Mystery Cylinder
I think it's a controller for the headlight. Has connectors that look like JST-SM connectors (2- and 3-prong) based on this ebikes.ca page
Other Notes
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Precharge resistor
- This is something that came up a lot in reading about detachable ebike batteries
- Prevents sparking
- Integrated in XT90 connector - source
- Should I use one?
- Forum post with some more info about precharge resistors. Note: "contactor" just means a high-power relay
- Some example precharge resistor circuits - http://liionbms.com/php/precharge.php
- Video about the XT90-S anti-spark connector
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Ooh! This looks like exactly the assembly on the back of my bike! Rear Rack eBike Battery 36V 13Ah 15Ah 17Ah 48V 12Ah 14Ah UPP Electric Biycle Bateria for 1000W 750W 500W 350W Bafang TSDZ2 Motor