Use the Goal Zero Yeti Tank Expansion Battery to increase the energy storage capacity of your Yeti Lithium Portable Power Station. When linked to the power station by means of a Yeti Link Expansion Module, this battery adds 1.2kWh of power for off-grid or power-outage situations. It's especially helpful when your portable power station is part of a long-term emergency power contingency system to keep the lights on and refrigerator running during prolonged power outages. It's also useful in an RV for long-duration road trips or in a seasonal cabin. The AMG lead acid battery has a peak capacity of 1200Wh, and an integrated cable on the back of the tank allows you to daisy-chain multiple tank units to further increase capacity. In order to connect the tank unit to a Yeti Lithium Power Station, an optional Yeti Link Expansion Module is required.