OPTIMA® BLUETOP® D31M group 31 batteries are our most powerful and have the largest energy storage capacity. Usually they can be mounted anywhere a (slightly shorter) group 27 would be used. Ultra high-performance SPIRALCELL TECHNOLOGY® AGM (absorbent glass mat) dual-purpose battery for marine and RV. BLUETOP® has three times the cycling capability (rechargeability) with ultimate cranking power for your boat or RV in a maintenance-free package. Perfect for multiple high-demand accessories and trolling motors with 15 times the vibration resistance and lighter weight. Lower internal resistance provides more efficient power output and faster recharges.
The OPTIMA® model number for this battery is D31M. If you are replacing an OPTIMA® battery you already have, this model is the same as batteries marked 8052-161, 9052-161, 27931, D31M-1125, BLUED31M, 27551, SC31DM, or N99D31MBLUE.
Please Download the Marine Application Guide above for further information on specific marine application.
|NSN:||6140 01 502 4405|
|UPC Code:||8 11405 00161 1|
|Cold Cranking Amps:||900|
|Nominal Voltage:||12 volts|
|Open Circuit Voltage (fully charged):||13.1 volts|
|Internal Resistance (fully charged):||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)|
High purity lead-tin alloy. Wound cell configuration utilizing proprietary
Sulfuric acid, H2SO4
|Case Color:||Light Gray|
|Cover Color:||“OPTIMA“ Blue|
|Group Size:||BCI: 31|
|Post Type:||Dual SAE & 5/16 Stainless Stud|
|CCA (BCI 0°F):||900 amps|
|MCA (BCI 32°F):||1125 amps|
The following charging methods are recommended to ensure a long battery life:
Recommended Charging Information
|Alternator:||13.65 to 15.0 volts|
|Battery Charger:||13.8 to 15.0 volts; 10 amps maximum; 6-12 hours approximate|
|Float Charge:||13.2 to 13.8 volts; 1 amp maximum; (indefinite time at lower voltages)|
|Rapid Recharge (Constant voltage charger):||Maximum voltage 15.6 volts. No current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below 1 amp.|
|Cyclic or Series String Applications::||
14.7 volts. No current limit as long as battery temperature remains below 125°F (51.7°C). When current falls below 1 amp, finish with 3 amp constant current for 1 hour.