Expand the capacity of the RIVER 3 Plus to up to 858Wh. Choose from two Extra Battery models to fit your needs: EB300 (286Wh) or EB600 (572Wh). An additional 140W of USB-C input and output option. Enjoy a wireless pogo pin connection—no cables or screws required. Reduce your load by using the Extra Battery independently. Looking to charge more devices or conveniently power your RIVER 3 Plus via USB-C? Adding this extra battery expands its capacity and significantly enhances its versatility with an extra 140W USB-C port, offering the RIVER 3 Plus a new charging and recharging option. With the USB-C port, the Extra Battery gives you the freedom to use it independently. Level up your RIVER 3 Plus with an Extra Battery. Compatible with RIVER 3 Plus, double capability high up to 572Wh. Hassle-free connection in a second. Adds an extra charging and recharging option.