It's the HTC Rezound running ICS. ive tried all sorts of combinations to save power - limiting syncs, background apps, turning off GPS, wifi, BT. i've tried days w/ 3G only, then days w/ 4G only. doesnt make a difference. i have the brightness turned down to about 30%. you name it, i've tried it. unfortunately, since the rezound has a great screen (still one of the highest ppi), i think it consumes the most power.
What phone and Android version are you using? On my GS3 I can easily go longer than a day off a charge, and I use it for all my email, twitter, and some Facebook I will generally pop it on the charger with a good 30-40% left on the battery after 16 hours