Weird Battery?

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http://forum.xda-developers.com – I just installed apex launcher yesterday and thought id change the power toggles icon to battery to keep an eye on how the launcher would affect my battery life. A few hours ago i charged my phone fully. I noticed the battery went to 98 percent fairly quickly but then it went back up to 100. I checked my battery stats to make sure it wasnt just the power toggles playing up. But the graph actually showed the battery percentage going up. Any ideas? (HowTos)