[haus]

If you're in a situation where your battery is draining from 100% to 20% in a few hours, (few being defined as less than 5 in this case) no new ROM/radio is going to help you. You have a systemic issue that needs to be solved, perhaps one of:

1. Wifi on all day
2. Terrible signal strength
3. 3+ hours of voice use
4. Dead battery
5. Rogue process using up processor cycles

Is your phone constantly hot? If so, that indicates (5). It's a big clue when you're not on a call and the top back part of your phone (above the battery) is warm to the touch when the phone is not supposed to be doing anything.

If your battery goes from 100% to 20% from 8am to 6pm with an hour or two of voice usage and push email going all day, that's about normal for a stock TP and battery.

What software do you have installed? How often do your POP accounts poll? Do you have any weather apps that download data in the background? Do you tether at all?

With respect to Raidzero's post about radios: you have exactly the same apps installed on those two phones, everything is identical except for the radio? I'm shocked and (honestly) in disbelief that radio software could account for ~40% battery difference in 90 minutes. (edit: corrected % and time)