Hard to see the black negative as it's under the bms. Also they have some kind of resin glue on them..A pic of the battery discharge pin connections.
Unless the battery was incorrectly wired up from the factory. I'm the first to open this battery and all I've done is replace the bms swapping cables like for like. Plus I replaced the blown fuse.It may be in the controller who knows. All I can say is that the melting of those two pins isn't normal or right.
Are you 100% sure polarity is correct on both sides of the battery contact.
No, I didn't think it would. But based on some corrosion I'd found in the battery I suspected they'd jet washed it. In which case the motor would need inspecting. Turns out it's fine. So if they did jet wash it there was no evidence of ingress in the motor.The hub won't cause the electrical connection issue of melting contacts.