Following the BatteryGate controversy of last year, Apple reduced official battery repairs to $29 each through 2018, down from $79. The company has now updated its web site with details of what will happen from January 1st, 2019.
In short, the prices will be going back up, but will still be cheaper than they had been. Battery repairs for iPhone X, iPhone Xs and iPhone Xs Max will retail for $69. Repairs for all older iPhones will cost $49.
So, if you have an iPhone X or earlier model, you can save at least $20 by initiating your battery repair before December 31st, 2018. iPhone X users are in a position to save the most money, as the price will jump from $29 to $69.
Both the $49 and $69 price points are cheaper than the $79 Apple charged prior to BatteryGate. You can check the status of your iPhone battery by looking at the Battery Health statistics in the iOS Battery settings pane.
Batteries with lower capacity are more likely to be dynamically throttled by the system, which can slow the device. Apple lets you disable the throttling manually but then you risk getting many unexpected shutdowns.
Apple tends to advise a battery repair once capacity drops to 80 percent or lower. If an iPhone battery drops below 80 percent whilst still covered by the warranty, you can get the replacement battery for free.
Via 9to5Mac