LG Shine Battery Problems

I've recently been charging my phone off and on, due to my hectic schedule, but I've always made sure to get it fully charged when I have the time. Originally, the battery life, while idling/making a few calls, and not using it very much has been about 2-3 days. However, recently, it seems to be down to 1.5-2 days now, max. I've only had the phone for 3 weeks.

Anyway, I last charged my phone, or rather, took it off the charger sunday around noon (I forget what time), and then when I went to bed last night, monday night, around 1am, there were still 2 bars left. However, when I got up 6 hours later, my phone had died. It wasn't multitasking when I went to bed, and this shortening of battery life is annoying me. Does anyone else have this problem with their LG Shine?

Excellent. Thanks!