Oscal BP3600 3600Wh Extra Expansion Battery Pack for PowerMax 3600 US Plug B5K7
Large capacity: 3600wh battery capcity, expandable from 3600wh to 57600wh. Model: BP3600. Battery Capacity: 3600Wh. Compatibility: Work with PowerMax 3600, can not be used alone. Applicable: for PowerMax 3600.