By connecting the Anker SOLIX C1000 A1761 Expansion Battery to the Anker SOLIX C1000 Power Station, you double the total capacity from 1056 Wh to 2112 Wh. This expansion provides the opportunity to enjoy an independent power supply for an even longer period. With the included connecting cable, you can effortlessly link the Anker SOLIX C1000 A1761 Expansion Battery to the SOLIX C1000 Portable Power Station.