Introduction
Make sure you have turned off your phone before starting. A newly purchased phone includes a rechargeable Samsung battery. Check out the device's troubleshooting page before changing the battery.
You may want to replace the battery if the battery can not hold charge, won't charge, or your phone does not turn on after a hard reset.
Tools
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Make sure the screen is face-down and the camera is opposite you.
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Insert the flat end of a spudger into the phone's top right rectangular slot.
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Use the spudger as a lever to pry open the back of the phone.
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With the spudger still inserted, carefully slide the spudger down the side of the phone.
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Gently peel off the back cover with your hand.
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Conclusion
To reassemble your device, follow these instructions in reverse order.