Nominal Voltage Rated capacity (20 hour rate) Total Height Height Length Width Dimensions Capacity affected by Temperature (20hour rate) Terminal Cycle Float Weight Approx 12V 18Ah 167 mm (6.57 inches) 167 mm (6.57 inches) 181 mm (7.13 inches) 77 mm (3.03 inches) 5.55 Kg (12.12 lbs) Capacity 25 (77 ) Internal Resistance Charge (constant Voltage) 20 hour rate(0.9 A) 10 hour rate(1.66 A) 5 hour rate(3.06A) 1 hour rate(10.8 A) 18.0 AH 16.6 AH 15.3AH 10.8 AH 1.5 hour discharge to 10.5V Full charged Battery at 25 (77 ) 6.8 A 14 m 40 (104 ) 25 (77 ) 0 (32 ) -15 (5 ) 102% 100% 85% 65% Capacity after 3 month storage Capacity after 6 month storage Capacity after 12 month storage 91% 82% 64% T3 T13 Initial Charging Current less than4.80A Voltage 14.10-14.40V Voltage 13.50-13.80V A W A W A W A W A W Time Constant Current(Amp) and Constant Power(Watt) Discharge Table at 25 (77 ) 5min 10min 15min 30min 1h 2h 3h 4h 5h 8h 10h 20h 9.60V 10.20V 10.50V 10.80V