And you charge it like it's an AGM? If there's a charge controller included there's no issue, you just feed it 14V or so and the charge controller does the rest.I'm curious about that. I have a lithium in my bike, had it for probably 6 years now. Never gave me grief, no signs of imminent death, even after sitting for well over 6 months untouched.
I have no idea if the BMW has an external controller or internal but there has to be one somewhere in the loop.