BBTorch is a real phone rather than being a nice flashy toy. It has a better battery life than the iPhone, has the BlackBerry Messenger and has better push email service, sturdier device than the iPhone.
I have the torch for work. I am not a heavy user on it, other than email, and get about 3 days on it before recharging. The biggest drain I have found on it is the wifi. While on vacation made it almost 5 days on just cellular, again really light usage.
Depending on your data package, since the bb uses like 1/3 of the data of a regular cell due to compression, may be more worth keeping it off.
Bar that could be the battery wearing out, if its a little older.