>>1953727I don't know anything about mid motors, so I can't really comment on this.
(with hub motors its real simple, you just install it in front wheel, use some motor controller and whatever throttle/display thingy, and here is your e-bike. Limitation is that hub motors are heavy, which means you can't get powerful motors, or they would affect handling).
As for batteries, it is really hard to say anything. It's a generic enclosure, and inside you can have anything from a fire hazard to a decent battery pack.
If you believe info on their site, batteries use either Chinese cells (DLG) or brand-name cells.
But thing is that cells are only half of the battery. Other half is how is it made? What kind of BMS did they use? Did they use fuses? Did they use paper gaskets?
From their amazon listing, battery is "meh".
https://www.amazon.com/DERUIZ-Battery-Lithium-Electric-Mountain/dp/B09C89RZGRCan't really call it an instant fire hazard, but they could have used paper gaskets on positive pole, and what kind of BMS did they use is a mystery.
What is good is that enclosure is plastic, so chance of direct short to metal is really low.
I'd be ready to disassemble it and inspect, and have $20 ready for replacement BMS just in case stock one doesn't have balancing, because lack of balancing will kill even good cells.
