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M_V
BrickMan
There is a diode pack somewhere on the bike, usually near the stator,might have gone bad allowing weird stuff to happen.
Yes on charging issue, it would go bad quite suddenly ime. Usually just a wire breaks or it shorts out against itself internally.
Go for a new battery, if it's more than 3 years old always worth getting a nicer one
Have a li on on the BMW. Been there about 3 years or so, even courier on it with hand warmers full tilt, lights on and a phone charfibg it never struggls