This is some very late info that has been released by RIM! The versions mention in the below statement are quite old and most 9800 users have moved on from them. Never the less, we would still like you to know that the Torch 9800 has experienced severe battery drainage issues based on certain operating systems.
The BlackBerry Torch suffers rapid battery drain and overall sluggishness due to the phone application utilizing high amount of CPU.
Currently I am running the newest official OS for the 9800 (126.96.36.1996 by Bharti Airtel) and I am not seeing any power drain issues like the ones spoken above. So, if you are running am OS in the range of effected operating system's I would upgrade to 188.8.131.526. If you need, feel free to check out our OS Upgrading Tutorial.