ICS Battery Issue (can't find old threads)

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http://forum.xda-developers.com – So I know there were people with battery issues when the first leaked official Samsung ics Roms came out, but I can't find the posts.... My tab is fully charged. But shuts itself off with 'low battery' after 20 minutes of use. How can I retrain the Samsung ROM to not do this? It's driving me crazy. Thanks! Sent from my HTC One X using xda premium (HowTos)