The ATN Extended Power Kit gives you plenty of juice whenever and wherever you need it. It has up to 22 hrs of continuous use, is easy to recharge, and can power other devices. This kit includes a USB to Micro USB with a L shaped connector and a adjustable buttstock pouch.
Specifications:

Nominal Voltage	1.6V
Rated Capacity mAh	16000 mAh
Configuration	Power Pack
Charge Time	10 hrs
Style	Power Pack
Includes
ANSI NEDA
Chemical Composition
Size
Rechargeable	Yes
Quantity	1