Remove the battery.

If there's any alcohol solution remaining in the phone, carefully wipe it off or allow it to air dry before installing your new battery.

Before you adhere the replacement battery, temporarily reconnect the battery connector to the motherboard socket. This ensures that the battery is properly aligned in its recess.

Adhere the battery, disconnect it, and continue reassembling your device.

If your new battery didn't come with adhesive preinstalled, refer to this guide for help replacing the adhesive strips.

Perform a force restart after reassembly. This can prevent several issues and simplify troubleshooting.