Introduction
This guide will demonstrate how to replace the battery of a Zenfone 3. This may be necessary if the battery has been damaged, will not hold a charge, or drains excessively quickly. For this guide, you will need the tweezers, Torx T2 screwdriver, a prying tool, and the Phillips #00 screwdriver.
Tools
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            Insert a prying tool between the screen and the metal backing of the phone at the bottom to remove backing from phone. 
 
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            Remove the two 3 mm screws, using the Phillips #00 screwdriver, on the silver band at the top of the battery and remove the band. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.