Drypower 6SB2.8PDrypower 6V 2.8Ah Sealed Lead Acid BatteryUsage and Composition Backup and Main Power Cyclic Use Sealed Lead Acid (SLA) Battery Specifications Voltage 6V Watt Hour 16.8Wh Nominal Capacity 2.8Ah Physical Dimensions Termination F1 (4.8mm Spade) Width 33mm Height 97mm Length / Breadth / Depth 66mm Weight 570g