How to replace iphone 7 battery in 3 minutes this video will show how i replace the battery in my apple iphone 7. if your battery is lasting less than 2 or 3 hours, or maybe it gets to 30. A battery in an iphone 7, or any smartphone for that matter, works like any other battery - it wears out with time. after about 300 cycles, i.e. 300 full charges and discharges, a significant drop. Use this guide to bring life back to your iphone 7 with a new battery. this guide instructs you to completely detach the display assembly; this is intended to prevent damage to the display cables..
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