Battery Canon Digital

Battery Canon Digital
Canon Powershot sd1200 is Digital Elph battery life span?

I just got a Canon Powershot sd1200 is digital elph about two months ago, and it’s already telling me to change battery pack, is that normal? I accidentally left it in the usb overnight, and I don’t think that would have drained the battery, but I’m wondering if the warranty covers this, or if I should just go out and buy a new battery,
I know I sound pretty stupid asking, but any help would help soooo much, thanks:)

Somewhere around 250 shots.

Battery Grip For Canon Eos 350d / 400d Digital Rebel XT / XTI – The Opteka BGRXT