This is a spare battery for the EcoFlow River Pro

POWER A WIDE RANGE OF APPLIANCES The RIVER Pro can power devices up to 1800W with X-Boost, which lets you power around 80% of home appliances and DIY tools. Use devices below 1200W for the best product use. 

• COMPACT AND PORTABLE The RIVER Pro weighs just 15.9 lbs and the RIVER Pro Extra Battery weighs 15.4 lbs, making them both portable and easy to transport. The RIVER Pro + Extra Battery can easily fit in a car trunk, on a campsite, or indoors, giving you the power to take your adventure anywhere.