Brando has released the Power Jacket with 4500mAh battery case designed for HTC One (M8). The case also comes with a front cover to protect the display, and a built-in stand allows you to prop your device at a comfortable viewing angle. As with other Power Jacket battery cases, the Power Jacket for the HTC One M8 supports both power and data passthroughs. Here's more info:
Charge the Power Case by USB cable. Plug the power station to charge your HTC One (M8) at any time and any where. To charge the phone, simply slide in the phone into the portable battery and slide ON-OFF switch to on.
Features: - Recharge HTC One (M8) On the Go - 4500mAh High Power Capacity - Charge with Micro-USB Charging Port Only - Lightweight and Protective - With Battery Power Indicator