Check the charge rate
Batteries need to be charged at about 13.8vdc. Not sure what the voltage would be on your BMW, but it should be very close.
If your bike is charging the battery at too high a voltage it will easily cause the lifespan to be short.
So my advice is to when you have the battery replaced with whatever type - have the workshop check you charge voltage. Otherwise you will be back sooner than later.
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To those who say it can't be done - stand aside for those who are already doing it.
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