I don't know to much about the pearl but if you're doing a lot of browsing, talking, and texting it may be right. Are you making sure you're closing your apps when you are done with them?
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I have a 8130 and I would say I'm a moderate to heavy user and my battery lasts Me all day. It goes off the charger at 7am and I still have 20 to 30 percent when it goes back on at 11PM.
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