Battery Chemistry: Lead Acid Hot Swappable: Yes Input Voltage: 120 V Number of Cells: 8 Output Voltage: 48 V DC Output Current: 70 A Battery Size: 12V Maximum Battery Recharge Time: 4 Hour Battery Characteristics: Sealed/User Replaceable Built-in Charger: Yes Expansion Ready (Daisy-Chain): Yes Replacement Battery Cartridge: RB1290X4N Replacement Battery Cartridge Quantity: 2 Circuit Breaker: 10 A Input Plug Type: NEMA 5-15P Input Voltage Range: 100 VAC - 125 VAC Nominal Input Voltage: 120 VAC Material of Construction: Metal Mounting Hardware: Yes Rack Height: 2U Online Thermal Dissipation: 74 BTU/hr