Samsung Galaxy Note II User Manual page 13

Insert the battery, contacts end first, and gently press the battery into place.
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Replace the battery cover, making sure all the tabs are secure and there are no gaps around
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the cover.
Note: When you insert the battery, your phone may power on automatically.
2. Charge the battery.
Insert the USB cable into the power adapter.
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Plug the USB connector into the charger/accessory jack on the bottom of your phone.
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Plug the AC adapter into an electrical outlet and charge your battery. Fully charging a battery
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may take up to three hours.
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