12 Volt 6 AH @ 20 hour rate
Power-Sonic Chargers: PSC-12500AC
Dimension (Length x Width x Height): L: 3.54" (90mm) W: 2.76" (70mm) H: 3.98" (101mm)
Designed for Cyclic, Standby and Solar Applications.

Features:

• Absorbent Glass Mat (AGM) technology for superior performance
• Valve regulated, spill proof construction allows safe operation in any position
• Power/volume ratio yielding unrivaled energy density Rugged impact resistant ABS case and cover (UL94-HB)
• Approved for transport by air. D.O.T., I.A.T.A., F.A.A. and C.A.B. certified

Manufacturer datasheet - PSH1255 (Adobe Reader required to read datasheet)

Quick Connect Terminal Version F2: .250" male
Nominal Voltage: 12 volts (6 cells) Nominal Capacity 20-hr. (300mA to 10.50 volts): 6.00 AH 10-hr. (560mA to 10.50 volts): 5.60 AH 5-hr. (1.02A to 10.20 volts): 5.10 AH 1-hr. (3.72A to 9.00 volts): 3.72 AH 15-min. (11.76A to 9.00 volts): 2.94 AH
Approximate Weight: 4.00 lbs. (1.81 kg)
Energy Density (20-hr. rate): 1.85 W-h/in3 (112.99 W-h/l)
Specific Energy (20-hr. rate): 18.00 W-h/lb (39.68 W-h/kg) Internal Resistance (approx.): 28 milliohms
Max Discharge Current (7 Min.): 18.0 amperes Max Short-Duration Discharge Current (10 Sec.): 60.0 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 (UL94 V-O flame retardant)