iPhone batteries are rated to hold 80% of their capacity for up to 500 charge cycles, which lasts roughly 18-24 months for most users. After that, your iPhone may need to be charged far more frequently, and iOS may warn you that performance is affected (in other words, your phone will run slower). Use this guide to replace your battery and restore your iPhone to like-new performance.
If your battery is swollen, [[What to do with a swollen battery|take appropriate precautions|new_window=true]].
Note: After the repair, your iPhone may [link|https://www.ifixit.com/News/32343/apple-is-locking-batteries-to-iphones-now|display a warning] about the “genuineness” of the battery, even when using original Apple parts. If your iPhone functions normally, you can safely ignore the warning.
For optimal performance, after completing this guide, [[Battery Calibration|calibrate]] your newly installed battery: Charge it to 100% and keep charging it for at least two more hours. Then use your iPhone until it shuts off due to low battery. Finally, charge it uninterrupted to 100%.
Mark your opening picks
Tape over any cracks
Anti-Clamp instructions
Screen information
Alternative method to unstick the battery from the case
Compare your new replacement part to the original part—you may need to transfer remaining components or remove adhesive backings from the new part before installing.
To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an [[E-Waste|R2 or e-Stewards certified recycler|new_window=true]].
Repair didn’t go as planned? Check out our [link|https://www.ifixit.com/Answers/Device/iPhone%20XS%20Max|Answers community] for troubleshooting help.