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I just had my iphone battery replaced at a reputable third party repair shop. The technician said to charge my phone to 100% and then let it drain to 10% or lower before charging it again. I came home and when I plugged in my phone it immediately turned on, but I noticed some things wrong. The battery indicator in the top right was red, and when I swiped down to see what percent it was at there was no number, I also noticed severe performance issues. My phone lags when swiping or opening any app. Additionally it keeps shutting down and turning back on again at short intervals. What is wrong and how can I fix this.

There could be a few reasons for this. ·         Battery connector not seated properly. The most likely is the battery connector. It has not been seated properly or the pins have been pushed into the plastic housing. ·         Faulty battery these symptoms will also occur when the battery is faulty. ·         Technician damage there are some tiny components around the battery connector that if nudged or knocked off will cause this problem. I would suggest taking it back to the repair shop. They should be happy to fix the problem. Guide