I joined this forum partly to post some battery test results from my Touch. I recently got my Touch and was a bit concerned with what I perceived to be a less then stellar battery life Granted, I had it jailbroken, tons of apps and most of my music is at a min. 192kbs mp3 (and most of that vbr). So I knew i was draining the battery faster than normal, but I wanted a real estimate of how long my battery would last to make sure it wasn't defective.
So I went to Apple's site and followed their instructions on testing an Ipod's battery life. I ripped a CD to 160kbs mp3, put it on repeat, started playing it, turned off the screen, wifi turned off, etc, etc. I left the volume and screen brightness to my user set defaults.
Apple lists the battery lasting up to 22 hours. I started this test on my fully charged Touch yesterday at 2:30pm. It is still playing as I type this. It's a bit past 1pm EST and that would so far make 22 1/2 hours of playback. The battery icon shows a tiny red sliver of battery left so I know it's about to go. Regardless, I'm pretty happy because I now know my Touch's battery is within Apple's specs and not defective (knock on wood).
So, if your'e unhappy with your battery life while doing other things with your jb'd Touch go ahead and run the battery test to make sure your batter isn't defective. That should hopefully make you feel better about the battery's performance when you are using it for other purposes.