Battery Model: D31M Part Number: 8052-161 Nominal Voltage: 12 volts NSN: 6140 01 502 4405 Description: High power, dual purposeengine start and deepcycle, sealed lead acid battery Physical Characteristics: Plate Design: High purity lead-tin alloy. Wound cell configuration utilizing proprietarySPIRALCELL
® technology. Electrolyte: Sulfuric acid, H
2 SO
4 Case: Polypropylene Color: Case: Light GrayCover: “OPTIMA“ Blue Group Size: BCI: 31 12.813”6.500” 9.375”59.8 lb 325.4 mm 165.1 mm 238.1 mm (height at the top of the boat terminals) 27.2 kg StandardMetric Length:Width: Height:Weight:
Terminal Configuration: SAE / BCI automotive and threaded stainless steel stud 5/16 – 18 UNC. Performance Data: Open Circuit Voltage (fullycharged): 13.1 volts Internal Resistance (fullycharged): 0.0025 ohms Capacity: 75 Ah (C/20) Reserve Capacity: BCI: 155 minutes(25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off) Power: CCA (BCI 0°F): 900 amps MCA(BCI 32°F): 1125 amps Recommended Charging: The following charging methods are recommended to ensure a long battery life: (Always use avoltage regulated chargerwith voltage limits set as described below.) Model: D31M These batteries are designed for starting and deep cycling applications and for use in boats withlarge accessory loads.