Battery
FLIP THE GALAXY S II over, and you’ll find the battery cover. Yes, that’s right, an actual battery cover—you can remove the Galaxy S II battery and replace it with a new one, unlike some other cellphones. To remove the battery, put your finger underneath the small plastic slot on the upper right and pull off the battery cover. You’ll see the battery, which you can easily remove by putting your finger into the slot at the bottom and gently pulling up. Don’t pull it hard or yank it.
Note
Before removing the battery, make sure to turn the Galaxy S II’s power off via the Power/Lock key.
To replace the battery, simply put it back into place. After you’ve put the battery back in place, replace the battery cover. Now turn on the Galaxy S II.

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