The Yeti Tank Expansion Battery integrates with a Yeti Lithium Portable Power Station and Yeti Link Expansion Module to increase your energy storage capacity. Each Yeti Tank lead-acid battery adds 1.2 kWh of energy storage to your system. NOTE: In order to chain a Yeti Tank to a Yeti 1000, 1400, or 3000 Lithium, you must use a Goal Zero Yeti Link Expansion Module. To use a Yeti Tank with a Yeti 1250 you will need the Yeti 1250 Ring Terminal Connector Cable SKU 98001.