Apple has published a guide for self-replacing the battery in the iPhone 16 and 16 Plus.

The most interesting part is the removal of the old battery. Previously, the company emphasized that it had simplified this procedure.

Now, a 9-volt battery and clamps are needed to remove the battery. The red wire is connected to the silver tab on the battery, and the black wire to the bottom right grounding screw on the lower speaker.

The wires must be held in place for 1 minute and 30 seconds to melt the adhesive under the battery. Apple warns that the longer the phone has been in use, the more time may be required to remove the battery.
Once the adhesive has melted, you can use a suction cup to remove the battery, and the remaining adhesive can be wiped away with an alcohol wipe.

In the iPhone 16 Pro and 16 Pro Max, three tabs must be pulled out with tweezers to remove the battery. This same design is used in other iPhones. Additionally, the speaker and Taptic Engine must be removed before taking out the battery, which is not necessary for the iPhone 16 and 16 Plus.

The process for installing a new battery remains unchanged. It is also glued to the case and rolled under a press. [Apple]