So, I replaced the battery on my '08 a few weeks ago. I'd neglected it, then had an opportunity to go on a ride. It wouldn't crank, so I tried to hook the car charger to it (big mistake). Wouldn't charge up, so I cancelled my ride and decided to let it sit overnight on the tender. Next morning- still showing 10.2 volts. Crap. Bought a new battery at the local dealer, installed and she cranks up strong. Next weekend went for a ride and noticed my heated jacket wasn't heating. Crap again. Got home, tested voltage at the tender leads- 0V. Hmm.....there's a fuse there, 7.5 Dig around the workbench, find a fuse, voila! 14.1 volts now, liner starts to heat. So, most likely my old battery would have been fine if I'd thought to check that little fuse. Oh well, with weather getting chilly here it's a good reminder for me to not get lazy and to keep the tender hooked up. That was the original battery, which normally was on a tender religiously. New one will likewise be taken better care of. If you don't let them drain waay down they last quite a while.