Lead Acid Battery (FM640A)

4.0Ah Nominal Capacity Rechargeable Sealed Lead-Acid Battery for Worldwide Export Nominal voltage: 6V Nominal capacity (20 hour rate): 4.0Ah Dimensions: Total height: 4.134" (105mm) Height: 4.016" (102mm) Length: 2.756" (70mm) Width: 1.889" (48mm) Mass weight: approx. 0.78kg Capacity (25 degrees Celsius): 4.4Ah (20 hour rate/220mA) 4.0Ah (10 hour rate/400mA) 3.6Ah (5 hour rate/720mA) 2.4Ah (1 hour rate/2400mA) 4 hour rate discharge cut-off voltage 5.1V/0.83A Temperature dependency of capacity (20 hour rate): 102% (40 degrees Celsius) 100% (25 degrees Celsius) 85% (0 degree Celsius) 65% (-15 degrees Celsius) Self discharge (25 degrees Celsius): 90% (residual capacity after standing 3 months) 81% (residual capacity after standing 6 months) 62% (residual capacity after standing 12 months) Charge method (constant voltage): Cycle: initial current: 1.2A or smaller Control voltage: constant voltage 7.25V to 7.45V (per 6V cell 25 degrees Celsius) Float: control voltage: 6.80V to 6.90V (per 6V cell 25 degrees Celsius) Note: the above characteristics data are average values obtained within three charge/discharge cycles, instead of the minimum values