Extend the power of your River 3 Plus or River 3 Max Plus with this 572Wh Extra Lithium Battery Pack. This black expansion battery connects via a wired connection giving you additional capacity for your portable power station. Weighing just 3.3kg and measuring 234mm x 224mm x 157mm it's compact enough to take wherever you need backup power. The battery comes with a 5-year manufacturer's warranty for long-term peace of mind. Model EFEB600.