Battery has confined recharge cycles and may finally need to be replaced. Battery existence and demand cycles differ by use and options. See apple.com/batteries and apple.com/iphone/battery.html For more info. The polymer bumpers provide excellent protection versus bumps and drops, although the soft microfiber lining keeps your phone on the lookout https://alecs-artistic-phone-cases.printify.me/product/7100937/alecs-swirl-046-phone-case-iphone-15-pro-max