Extend the power of your River 3 Plus or Max with this 572Wh extra lithium battery pack. This wired expansion battery gives you additional capacity when you need it most connecting seamlessly to your existing power station. Weighing just 3.3kg with compact dimensions of 234mm × 224mm × 157mm it's easy to transport wherever power is needed. The sleek black design complements your main unit while adding substantial power reserves. Comes with a reassuring 5-year manufacturer's warranty for long-term peace of mind. Model EFEB300.