Battery on verizon razr v3 dies in one day or less- bad service or bad battery (see details)?

i bough an inpulse vzw razr from walmart in february. it has had poor battery life the whole time. i have noticed that the battery which used to last for a couple days now only lasts for one day or less. i now have to charge it every day and somtimes a "booster" during the day. i have spotty service in my house (have to go outside to make/recive calls that i can understand)but the service at school is pretty good. i was wondering if the battery is bad or it is just going dead faster because i am home all the time in the summer (no school). also are there any ways to get as good battery life as my other phone (1-2 weeks)? thanks!!