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My iPhone 6 had battery issues like any other iPhone right now and I replaced the battery from an unauthorised dealer. It was pretty cheap and I replaced it in February 2017. It was working fine until May 2017, when the phone would turn off after using it for 10 minutes and would be stuck in a boot loop. I can’t use it even for a few minutes and If i start using snapchat or at the camera app it shuts down immediately and will be stuck in a boot loop NEED HELP ASAP
Unfortunately you will have to get the battery replaced again. To get a good battery either try Apple which are rather expensive in offering a replacement but are guaranteed good brand new quality batteries or iFixit replacement part to do it yourself. iFixit does have very great customer service that will help you out with any questions or warranty issues. Where to buy an replacement battery (iFixit): iPhone 6 Battery Where to buy replacement adhesive strips for sticking the replacement battery on: iPhone 6/6s/7 Battery Adhesive Strips Guide to replace battery: iPhone 6 Battery Replacement
