An extra 286Wh battery expands the RIVER 3 Plus system to a combined 572Wh when connected. Connection is handled through a pogo pin design, so stacking the battery does not require separate cables or screws. Independent use is also possible, with a 140W USB-C port available for charging smaller devices or recharging the unit directly. LFP battery chemistry is designed for long service life, supported by multiple protective features and real-time monitoring. IP65 splash resistance and a casing rated to UL 94V-0 improve suitability for outdoor or backup use. Charging can be done through USB-C directly, or through the main unit via AC, solar, or vehicle input.
