Performance Specifi cations Nominal Voltage ...........................................................................6 volts (3 cells) Nominal Capacity 20-hr. (2.9A to 5.25 volts) .............................................................. 58.0 AH 10-hr. (5.6A to 5.25 volts) .............................................................. 56.0 AH 5-hr. (10A to 5.10 volts) ................................................................ 50.0 AH 3-hr. (15A to 4.50 volts) ................................................................. 45.0 AH 1-hr. (35A to 4.50 volts) ............................................................... 35.0 AH Approximate Weight ........................................................... 19.50 lbs. (8.8 kg) Energy Density (20-hr. rate) ................................. 1.34 W-h/in3 (81.97 W-h/l) Specifi c Energy (20-hr. rate) .............................. 17.85 W-h/lb (39.34 W-h/kg) Internal Resistance (approx.) ........................................................ 6 milliohms Max Discharge Current (7 Min.) ................................................. 174 amperes Max Short-Duration Discharge Current (10 Sec.) ................... 580 amperes Shelf Life (% of nominal capacity at 68°F (20°C)) 1 Month ...................................................................................................... 97% 3 Months ..................................................................................................... 91% 6 Months .................................................................................................... 83% Operating Temperature Range Charge .. ........................................................... -4°F (-20°C) to 122°F (50°C) Discharge ....................................................... -40°F (-40°C) to 140°F (60°C) Case ...................................................................................................... ABS Plastic Power-Sonic Chargers ................................................PSC-64000A, 64000A-C