Battery Case for iPhone 11, 4500mAh Slim Portable Protective Charging case Compatible with iPhone 11 (6.1 inch) Rechargeable Battery Pack Charger Case (Black)

Capacity: Power banks come in various capacities, measured in milliampere-hours (mAh) or watt-hours (Wh). The higher the capacity, the more charge a power bank can provide to your devices., USB Ports: Power banks typically have one or more USB ports for connecting charging cables. Some may also have USB-C or micro USB ports for recharging the power bank itself., Fast Charging: Some power banks support fast charging, which can significantly reduce the time it takes to charge your devices., Size and Weight: Power banks come in various sizes and weights. Smaller ones are more portable but may have lower capacities, while larger ones can provide more charge but may be heavier and less convenient to carry., Safety Features: Quality power banks often come with safety features such as overcharge protection, short-circuit protection, and temperature control to prevent damage to both the power bank and your devices.