Haven't had much time to think about this. Could you put a toggle switch on the bike to disconnect the battery any time you shut off the engine? I don't mean disconnect the heavy cables, just where the voltage regulator/rectifier supply would reach the battery. The idea being to open any path that would be a parasitic draw. This should keep the battery voltage OK.
We should find out if the voltage reg/rect is really carrying the load of the machine. Normally the R/R output voltage does not vary much. At idle with the lights on it might drop to 12V, but should be around 13V at anything above idle. If voltage drops below 12V, then the battery is carrying the load.
The battery is not meant to do much more than start the bike. As soon as the engine is running the stator should take over from the battery. What about mounting a voltmeter on the bike? This could verify that you are getting the correct voltage from the stator and R/R at all times.
Going back many years all cars had ammeters on the dash board. My Studebaker would always display current flow. A minus value meant the battery was carrying the load. A plus value showed the generator was carrying the load. This was a better indicator than just voltage, but you had to know what it meant.
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2011 EC250E
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