Sounds like it. I was mucking around with mine every 30 minutes or so yesterday sending texts and playing with settings and it went the entire day with 50% leftover. I did turn the brightness down to 10 (which actually looks just fine and is not dark at all).

I did follow a tip I read about in an android forum (gasp) where people were trying to condition their android batteries to last longer. On the first day I charged it up to 100% and then used it until it completely died - ie device shutdown entirely. Then charged it up again to complete a full cycle. I think they claim it greatly improves battery life. I honestly don't know if it did anything but I did do it after I bought the device.