Some related info from the CM7 thread:
Originally Posted by tickerguy
My battery burn is about 4% an hour idle (screen off) with "push" email through K9, but otherwise nothing running in the background (other than Gmail notifies, calendar event syncs, etc.) I do not allow random apps (e.g. Facebook, Twitter, etc) to sync automatically and you shouldn't either unless you like dead batteries.
For power management keep in mind the following things:
1. Wifi is a power pig. If you leave it enabled on battery it's going to suck the juice. In a good signal area 3g is better. In a bad one Wifi is better because 3g is seeking a signal often which is terrible.
2. The phone cannot enter the deepest sleep states with Wifi enabled and wakes up a lot when data is connected on 3g. This results in ~35ma or so of idle current with a data connection up and roughly 50ma with Wifi up (remember, Wifi also has the cell radio on, although 3g data is down.)
3. A seeking radio is the worst case. Attempting to re-acquire a cell or Wifi signal murders battery life as that requires actively transmitting. Transmit = bad, receive = much less bad.
4. If you are off charge do not have Wifi on when not where there's a connection for you consider something like "Juice Defender". This phone has a nasty power profile when data is up, even on cell and even when it appears no data is being run over the connection. It is what it is; this is true on Froyo as well. Juice Defender will kill the data connection most of the time when the screen is off but bring it up every 15 minutes or so to check for background transfers. The gain in battery life on this phone from doing that is very significant. This doesn't inhibit getting calls or text messages while the phone is "sleeping" and is nearly transparent. In fact I'm considering trying to figure out a way to patch CM7 to build in some of that functionality without an app, as a "timed" data enable could be a monstrous power saver.
5. Accept that if you have the screen on you're going to burn up the battery. Ditto if the CPU is pegged doing work. Between the two it is entirely possible to run power levels of 500ma or more, which will exhaust a full batter in under three hours. This is not unique to the Triumph; the more CPU you have and use and the more backlight you have on the less time the battery will last.
I get about 3 hours of "heavy" browser use out of the battery. That's pretty good - on par with my other Android devices over the last couple of years. If I am going to be away from a charge source all day and want to make heavy of the phone I carry a spare battery with me.
I have found that following those tips and using Juice Defender Ultimate to toggle my data I can get a full day of light to moderate use easily from a full charge (maybe more, but I charge it every night). Like it was stated there though, I only get a few hours with heavy usage.
There is no way I am going to overclock to 1900. Maybe a slight overclock if I can see proof that it hasn't harmed anything and I get some sort of benefit from it. Since I don't play many graphically intense games, I haven't seen much use in overclocking my phone.
I haven't tested it, but I have noticed with wifi and 3g off my battery life is immensely long, so I assume it is doing the "deep sleep" just fine.