After about 20 charges and being extra careful with the battery installation inside the bike fairing, we stumbled upon this problem:
We also saw that the plug on the bike was in less than excellent shape...
A few seconds with a soldering iron cured this of course, so we had time to run it and let the cat try to catch it!
I had to resolder both cables on the battery, since the red was also almost ready to fall. However, the battery being tiny, it needed a very careful and steady hand to do the soldering and not destroy the smallish -and very rare at the moment- battery!
Disassembly...