The "rock-solid" large USB external battery ("power bank") with a capacity of 10,000 mAh can store enough energy to charge USB-compatible devices, such as e.g. the Case Relay, TetherBoost Core Controller, tablets, phones, iPods, CamRanger, etc.

The two output ports allow you to charge two devices at the same time. The port on the right can deliver 2.1A, so it can be used to charge Case Relay, TetherBoost, iPad, or tablet. The 1A port on the left can be used to charge other devices, e.g. a CamRanger, iPhone, iPod, Android devices, PSP, smartphones, and any USB device. The Rock Solid External Battery Pack provides up to 50 hours of operation time for an iPhone 6 and up to 20 hours for an iPad Air 2.

The power bank contains lithium-polymer batteries and a microchip that adapts the voltage to the device connected to the charger. So no matter which port you choose, it will never damage your device.

When the power bank runs out, charge it the same way you charge any phone or tablet. Its small size and high energy capacity make this device ideal for supporting your equipment during long photo or video shoots and during extensive travel.