Apple has released its Smart Battery Case for the latest generation of iPhones. This includes the iPhone 11, the iPhone 11 Pro and the iPhone 11 Pro Max.
The Smart Battery Case, as the name suggests, is a case with an integrated battery that perpetually charges the phone until the battery in the case drains. Once that happens, the phone switches to using its own battery. Apple claims you get 50% additional battery life with the case on top of the already excellent battery life on these new iPhones. You also see the battery level for the case in the iOS battery widget.