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Hi, please help!! I’ve had my phone for a while now, as I’m using my phone, a lot of the time no matter what app I’m on or what I’m doing or what battery % my phone is at (yes even 100%) it : Turns offThe apple logo appears as if it were restartingThen it opens up to 10%If I turn it off again on again it goes to 75% then shuts down in less then a minuteThen if I do it AGAIN it goes back to 10%It happens If my phone isn’t connected to the wall/ electricityAnd when it doesn’t do all that crazy stuff, it loses battery quicker than an iPhone usually does ,like actually just right now it was at 100% (it was on do not disturb and battery saver, I had just taken it off the charger) I tie my hair up and when I pick up my phone to walk to my car it’s on 35%
The battery is on it’s way out. You’ll need to get the battery replaced. If you decide to replace the battery yourself I have linked guide and parts for how to do so: iPhone 6s Battery Replacement iPhone 6s Battery