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Premium quality products, excellent support, that's what we provide to you. Before installing: A. Confirm the phone model B. Discharge the battery below 20% before you start. C. Shut down the phone D. Don't puncture the battery. If you replace it by yourself, we highly recommend watching more relevant videos on this process. Please Note: At the first beginning, the battery will drain quickly, this issue is caused due to the li-ion of a new battery is unstable, it will become normal after long-term use. Please full charged first if phone can not turn on. To use the battery longer, please use up all the energy of battery until your phone shuts down automatically, then charge it for up to 10 hours, repeat this 3-5 times, thus the battery can be reached the optimum effect of using. Q1: Battery can not be installed A: You might purchased the wrong battery model or got the wrong one. Q2: Unable to turn on the phone. A: The ribbon cable might be broken; the cable does not connect well or the battery is power off. Please re-install all cables and charge the battery for a while then try again. Q3: keep rebooting or blinking apple logo A: The ribbon cable does not connect well, please re-install the cable. Q4: APP of capacity testing shows that capacity loss seriously after few days used. A: ALL third-party APP of capacity testing are only shows a vague result for reference and have no authority, please take practicality as standard.