We're building a repairable and sustainable e-bike battery at https://gouach.com :)

That's pretty cool. It's nice to see this exists.

For me, I'll probably send an email later to support to ask (no rush, since it's out of stock anyway), but I was checking for info on compatibility with Yamaha (e.g. my Cross Connect) ebikes. It's not on the compatibility list. They make their own (mid-drive) motors (PW-SE on mine I think) and proprietary batteries. They pulled out of the United States market altogether so getting more batteries from them again is doubtful. (Mine currently charges to ~85% and then throws an error code, but it still works for now.) It is a Yamaha 500Wh36V battery pack on the down tube with 3 wires (I just unscrewed where the battery plugs in to see).