This replacement battery is what you need to bring that dead smartphone back to life.
For optimal performance, calibrate your newly installed battery: Charge it to 100% and keep charging it for at least 2 more hours. Then use your device until it shuts off due to low battery. Finally, charge it uninterrupted to 100%.
Note: After replacing your battery the Battery Health feature on your phone will display “Service” and a message about needing to have your phone checked by an authorized service provider. Rest assured that the battery and your phone are fine. iOS shows this message anytime a battery is replaced by anyone other than an authorized service provider. Your phone will function 100% normally other than Battery Health not reporting the health of the battery.