Charge and maintain your iPhone battery — by Apple Support

Explains how to arrange a battery repair or replacement, the estimated out-of-warranty fees and when AppleCare may cover it.

Ways to find what is using battery and save power, including checking daily usage, using Wi-Fi, Low Power Mode or Adaptive Power, and checking battery health.

States the operating temperature range and explains what happens when a device overheats, including what to do if a temperature warning appears.