PowerSonic rechargeable sealed lead acid battery. 12V 55.0 AH with universal terminals: heavy duty posts with nut & bolt fasteners.Product Features:Absorbent Glass Mat (AGM) technology for superior performanceValve regulated, spill-proof constructionPower/volume ratio yielding unrivaled energy density Rugged ABS plastic case and cover Dimensions: L=5.45" x W=9.04" x H=8.98"Approved for transport by air. D.O.T., I.A.T.A., F.A.A. and C.A.B. certifiedU.L. recognized under file number MH 20845Specifications: Nominal Voltage: 12 volts (6 cells in series) Nominal Capacity: 20 hour rate (2.75A to 10.50 volts) .............55.0 A.H.10 hour rate (5.10A to 10.50 volts) .............51.0 A.H.5 hour rate (8.80A to 10.20 volts).............44.0 A.H.1 hour rate (30.6A to 9.00 volts) .............30.6 A.H. 15 min rate (96.0A to 9.00 volts) .............24.0 A.H Approximate Weight: 41.3 pounds (18.77 kg) Energy Density (20 hour rate): 1.66 Watt-hours/cubic inch (101.4 Watt-hours/l) Specific Energy (20 hour rate) : 16.0 Watt-hours/pound (35.16 Watt-hours/kg) Internal Resistance (Fully Charged Battery): 5.5 milliohms (approximately) Maximum Discharge Current ( ≤ 7 Min.): 165 amperes Maximum Short-Duration Discharge Current ( ≤ 10 Sec.): 550 amperes Terminal configurations: Universal terminals: heavy duty posts with nut & bolt fasteners 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: -4°F (-20°C) to 140°F (60°C) Case: ABS PlasticCharging Characteristics:Cycle Applications: Limit initial current to 15A. Charge until battery voltage (under charge) reaches 14.40 to 14.70 volts at 68°F (20°C). Hold at 14.40 to 14.70 volts until current drops to approximately 550mA. Battery is fully charged under these conditions, and charger should either be disconnected or switched to "float" voltage."Float" or "Stand-By" Service: Hold battery across constant voltage source of 13.50 to 13.80 volts continuously. When held at this voltage, the battery will seek its own current level and maintain itself in a fully charged condition. NOTE: Due to the self-discharge characteristics of this type of battery, it is imperative that they be charged after 6-9 months of storage, otherwise permanent loss of capacity might occur as a result of sulfation.
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