The Portable Charging Station allows you to recharge the Guzzle H2O Stream in the field. A 9000 mAh LiFePO4 battery recharges the Stream 3 times. This extends your capacity 96 gallons for a total of 128 gallons of pumped, filtered, and purified water. It comes in a case similar to the Stream, and is 10.2” x 7.9” x 4.5”. When your Stream has run out of charge, plug it into the Portable Charging Station, and it recharges your Stream in 2 hours. The Auxiliary Battery is rechargeable through a 12v plug. A 12v plug is included. The Portable Charging Station can also be used with the optional Solar Charging Adapter.