I fixed my broken fuse with a standard automotive 12V 10A mini fuse, no issues so far.

Our RadCity 5 Plus battery stopped charging after the first trip. The RadRover 6 Plus that we got a few weeks earlier was fine. While I read the fine print and plugged in the battery to the charger first, those Rad bikes are the only devices that need charging and that require to do so (incl. my PHEV car and portable battery based generators).

Anyway, support asked me to send a video, which I did (showing the correct plug in order) and they send me a new battery. No RMA for the old one, so I replaced the fuse and it's as good as new and we ended up with a nice spare battery.

While some effort, replacing the fuse is not rocket science. But everybody in engineering on the semi-integrated battery team should be fired. Bad design. Let hope the next gen more-semi-integrated battery has an externally accessible fuse again. Or even better a fuse that can be reset by the push of a button.

Before spending $600 for a new battery I would definitely try replacing the fuse.

Our 1 week old RadCity 5 Plus battery will not charge anymore either. Was fine after getting the bike (battery 50%) charged, two bars down after first ride no more charging. Tried my RadRover charger (same battery), same thing. Battery works though, bike runs fine on battery, just the battery will not charge anymore. Waiting to hear form support about next steps.