B1000 Expansion Battery. 1152Wh LiFePO4 battery for over 3,500 life cycles. AC high voltage input 0-100% full charge in 2 hours; Standalone power station with USB-C, 12V/10A car port and USB-A port. Compatible with R1500 for a maximum of 4,608Wh capacity. (1*R1500+3*B1000) Only Works with R1500 +B1000. Buy Now and Save $45 Off B1000 Expansion Battery for R1500. Use code: B1000NEWA at checkout.