The ENERGI Power Case provides an ultra-modernistic feel and look unlike any designs out there. It's sleek and slim, weighs just 3.oz (85g) and adds just 1/2 inch (13mm) to the length of your phone. It's less bulky than most cases that don't have a built-in battery.
Built-in rechargeable 1800mAh Lithium Ion battery
Provides up to 5 hours additional talk time
Built-in metal kick stand
LED status indicator lights
Thin, compact design adding just 1/4 inch (6mm) to thickness and 1/2 inch (13mm) to length
Charge, sync, transfer data, and listen to music with the case on
Charge and sync cable included
Microphone portal
Anything for an S4?