Optima D31M

Category: Product ID: 4053


Model Voltage
CCA (Amps)
Ah (@ C20)
RC (in mins)
Weight (kg)
Dimensions** (L x W x H)(mm)
Dual –
19.6 Dual –
800? 66 140? 24.4 Dual –
900? 75
155? 27.3
Dual –
?*Specifications may change without notice **Dimensions are overall maximum and include all handles
Optima Blue Top Marine Battery

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.

Battery Model: D31M
Part Number: 8052-161
NSN: 6140 01 502 4405
UPC Code: 8 11405 00161 1

Performance Data

Cold Cranking Amps: 900
Cranking Amps: 1125
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)

Physical Characteristics

Plate Design: High purity lead-tin alloy.? Wound cell configuration utilizing proprietary SPIRALCELL TECHNOLOGY?.
Electrolyte: Sulfuric acid, H2SO4
Case: Polypropylene
Case Color: Light Gray
Cover Color: ?OPTIMA? Blue
Group Size: BCI: 31
Post Type: Dual SAE & 5/16 Stainless Stud
Weight: 27.3 KG
Length: 329?mm
Width: 171 mm
Height: 238 mm


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 a voltage regulated charger with voltage limits set as described below.)

Model: D31M
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.


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