How can I change my battery?

You should get this done at an authorized Apple repair facility. Otherwise any warranty and further Apple support will be voided.

iPhone Battery Replacement - Official Apple Support

iPhone Battery Replacement:

Current Apple Prices:

• No charge for in-warranty or AppleCare+ plan.

Out of Warranty Prices:

• iPhone X or newer: $69 U.S. Dollars.
• Older models: $49 U.S. Dollars.

➢ Check AppleCare Coverage.

Click ▶︎ iPhone Battery Replacement.