I've been having a pretty rough time with my battery lately. My status bar says it's draining extremely fast, about 1% lost in under 5 secs. But when I turn off my system and plug it in, the charging animation say I have WAY more battery power than what I was told prior to shutdown. I turn it off at around 15%, but shutdown and plug in says low 80s. And if I have it plugged in while it's on, the battery percentage still goes down. Does anyone know why this is happening?