If your battery is more than 2 yrs old, it's probably the culprit. I get my batteries from Costco They're like $30, and come with a 2yr 100% replacement guarantee. So if it dies within 2 years, you get a free battery. Beyond that, they give you a certain percentage for up to 72 months(6 years). Also, if the cashier forgets to mark the date the battery is sold by removing the little labels(like they forgot to do on mine:naughty: ), then you can pretty much come back whenever, and get a free replacement battery.