I've got a R100GS that had a new battery installed last year, and was last rode 14 months ago before being put on the BMW battery charger. This bike started and rode fine, even with the old gas. I pulled off the battery caps and all but 2 cells had water. Questions- Do you think this damaged the battery? Or because it started with good power it should be fine? Is the BMW battery charger ok to use for long term or should I get a battery tender with the porper plug?