Want to give your old iPhone the gift of a new battery for the low price of $29? You better act fast. Following the iOS battery throttling "scandal," Apple introduced a $29 battery replacement program. But this low-cost offer comes to an end at the end of the year.
Must read: iOS 12.1: Tips and tricks to help you get the most from your iPhone or iPad
This offer applies to the iPhone 6 and newer (to iPhone X), and doesn't require that your battery be degraded below the 80 percent capacity, a threshold that Apple normally uses to determine if a battery is worn.
To take up this offer, head over to https://getsupport.apple.com and click iPhone > Battery & Charging > Battery Replacement and then choose Bring in for Repair or Send in for Repair to get the ball rolling.
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If you put this off until next year then the price for most iPhone battery replacements goes up to $49 (except an iPhone X battery replacement, which will go up to $69).
Out of warranty battery replacement for the iPhone XS, iPhone XS Max, iPhone XR costs $69.
Which reminds me... where's my old iPhone 6 Plus? I need to send it in before the year's out.
iOS 12 tells you (almost) everything you need to know about your iPhone's battery