||Ah (@ C20)
||RC (in mins)
||Dimensions** (L x W x H)(mm)
|| Dual –
||19.6|| Dual –
||800||66||140||24.4|| Dual –
|| Dual –
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.
Warranty: 2 years private use, all OPTIMA® have their warranty details on the top label and are honoured by the warranty stated on that label.
|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)|
|Plate Design:||High purity lead-tin alloy. Wound cell configuration utilizing proprietary SPIRALCELL TECHNOLOGY®.|
|Electrolyte:||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:
(Always use a voltage regulated charger with voltage limits set as described below.)
These batteries are designed for starting and deep cycle applications and for use in vehicles with large accessory loads.
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.
All limits must be strictly adhered to.