Hmmmm, I don't think it would be possible to track where the battery is being used in terms of apps (I may be wrong) as the battery isn't allocated to any particular app but rather the OS which alloactes CPU usage that consumes battery power.
With regards to what you want, I would suggest you search for an "activity monitor" app or something in Cydia which will allow you to monitor activity. I would check for you, but I'm not jailbroken.
Hope that helps.