Motorola Krave ZN4

I was wondering what anybody's thoughts were regarding Mobile Email chewing into the battery life. I came home from vacation yetserday with the battery completely drained and put it on the home charger. After is said "Battery Completely Charged", I took it off the charger and turned the phone on. This was at about 11pm. I woke up this morning around 10am and the battery was down to 2 bars from 4. The only think that could have been going on was the relay from the Mobile Email. Anybody else experiencing anything like this?? FYI, I get perfect service as I can see the tower from my house here in Florida & it is also a phone I just purchased this past Tuesday so perhaps the battery needs to go through a few more charge cycles.