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Sounds to me like you have 1 or 2 shorted cells. There's 6 cells in a 12V lead-acid (auto/moto) battery. Fully charged, and at no load, each cell should be 2.2V, so 2.2 x 6 cells = 13.2V. You should try to measure the battery to see if it's close to 13V. If it's 11 ish, one cell is gone.

When a cell shorts, the battery will try to overcharge itself, because what's normally a 13.x V trickle charger, is now trying to pump 13 V into a 9 or 11V battery, and this battery wants to stay at say 11V. So it does this with more current. Then you'll get bubbling from overcharging the remaining cells that are OK.

It's even worse running the bike, because these newer DUCs (1999 and on) have a 520 Watt alternator. They can push out 40 Amps, and these amps are going to go where they think they're needed---right into your crappy 11V battery.
 
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