I am wondering this myself. Juice Defender free edition helped my battery last longer today, but I am considering the paid edition if it help more. I am really interested in the 2G/3G/4G switching, but it says that it has to be supported by your ROM. I don't want to pay for it and the main feature I want not work. I would like the phone to switch to 2G when the screen is off so that I save battery and still have notifications.
