iPhone 6s replace battery
how I can replace battery iPhone 6s ,
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Make an appointment at an Apple store genius bar, or use the Contact Support link at the top of this page for mail-in service. The cost of a battery replacement in the US is $49. Prices are comparable in other countries.
But first make sure the problem is the battery. Go to Settings/Battery - Battery Health. If it says the battery is not up to standards or the percentage is less than 80% then you need a new battery. If not then you need to look for other possible causes.