how to replace battery on old iphone?
Replacing the battery via Apple The most convenient and reliable way to replace your iPhone's battery is to do it straight through Apple. Simply swap out your old battery for a brand new one. For iPhone X, XS, XS Max, XR, 11 Pro, 11 Pro Max, and 11 the cost is $69 for an out-of-warranty model not covered by AppleCare+.