12 Volt 21 AH @ 20 hour rate
Power-Sonic Chargers: PSC-122000A,124000A,122000A-C,124000A-C
Dimension (Length x Width x Height): L: 7.14" (181mm) W: 3.03" (77mm) H: 6.59" (167mm)
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

Batteries used for seasonal use (not year round) : Due to the self-discharge characteristics of this type of battery, it is imperative that charging should be done within 6 months of storage, otherwise permanent loss of capacity might occur as a result of sulfation. Deep cycle batteries are strongly recommended for seasonal use applications : battery operated lawn mower, golf cart, golf caddy ,etc Deep cycle version: see PDC12200

Permanent loss of capacity (Due to sulfation) : A battery might only be able to be charged to a reduced full capacity at 75% or less of its original capacity rating. Example : a 21 ahr battery becomes a 15ahr battery (or less) due to sulfation (chemical reaction inside battery).

Manufacturer datasheet - PSH-12180FR (Adobe Reader required to read datasheet)

Nut/Bolt Version Nominal Voltage: 12 volts (6 cells)
Nominal Capacity 20-hr. (1.05A to 10.50 volts):
21.00AH 10-hr. (2A to 10.50 volts): 20.00AH 5-hr. (3.7A to 10.20 volts): 18.50AH 1-hr. (13A to 9.00 volts): 13.00AH 15-min. (40A to 9.00 volts): 10.00AH
Approximate Weight: 13.20lbs. (5.99kg)
Energy Density(20-hr. rate): 1.77 W-h/in3 (107.86 W-h/l)
Specific Energy (20-hr. rate): 19.09W-h/lb (42.09W-h/kg)
Internal Resistance (approx.): 12 milliohms
Max Discharge Current (7 Min.): 63.0 amperes
Max Short-Duration Discharge Current (10 Sec.): 210.0 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)