> You can also make them yourself at home, although it can get relatively dangerous if you don't know what you're doing... same as with replacing an outlet at h

> You can also make them yourself at home, although it can get relatively dangerous if you don't know what you're doing... same as with replacing an outlet at home, but more of a fire damage instead of a shock risk, so definitely not for everyone, but with some basic precautions, can be done safely. Did that for my semi-diy bike. Got an older Sparta with stupid DRM in it, removed all the sparta parts, made a custom PCB for the motor/hall sensors and had the NiMH battery replaced it with a custom 7s9p pack (in frame so was limited in options) resulting in a nice 650Wh battery instead of the 200Wh it used to have. Using recycled cells from a crashed scooter resulted in a (relatively) cheap, reused ebike.