I don't think there are any registry settings that are going to increase you battery life much. I would first try making sure I had adjusted all the available settings, like having the backlight turn off as quickly as possible, turning BT off when not in use, etc.
Sprite backs up all the additional info that a user places on the phone, not the actual ROM of the phone. It is impossible to upgrade the ROM through a Sprite Backup. You would have to get the ROM from somewhere, but don't bother asking us where. It is against the rules, we only post links to legal firmware upgrades like the 1.43 ROM on Motorola's website. You'll get the same answer I'm about to give you, Google.
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Phone: Sprint Touch Pro
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