Haven't ridden the busa in a few weeks, maybe closer to a month. Had the day off today so I went to go out for a quick ride and the battery was dead as snot. Checked the voltage and it was reading 6.5 volts!!! Not sure what the lowest voltage these batteries can handle, but I think it might be beyond recovery. Bike is an 08, brand new battery and rectifier was installed through dealer (I believe in 09) through warranty, because the bike was dying after a short ride and the rectifier was bad. Have a power commander hooked up and my gps charger, but the gps wasn't being charged while it was sitting. Have had it on the battery tender for about 4 hours now and it's back up to about 12v, still can't get it to turn over though. Gonna leave it plugged in until fully charged and hopefully she'll start, if not i guess i'll be heading to the dealer for a new battery. Battery should only be about 3 years old, I would think it would hold a charged longer than a month? Bike has about 16k miles