Hey everyone. Having a few problems with my girlfriends gsxr. The bike has stalled with a flat battery twice in the last two weeks. I fully charged the battery and I'm reading 12.5v when the bike is on the battery voltage drops fairly quickly and does not change when reved. I assume this will be the charging unit... a rectifier? Not sure what bikes actually run. Is this a common thing for gsxrs? Is there anything else to look at and would anyone have any idea what the replacement cost is? Is it a labout intensive job? I will do the ring around during the week to find out but just want to confirm it's my issue first. Sorry it's a 2007 if that matters.