CCA 900
Capacity 75Ah(C/20)
CA 1125
BCI Group Size BCI 31
Reserve Capacity BCI: 155 minutes (25 amp discharge, 80 degree F(26.7 degree C), to 10.5 volts cut-off)
MCA 1125
Bullet Points

” Both dual purpose and starting applications available
” Up to three times more recharges
” More than 15 times the vibration resistance
” Completely spillproof, mountable in virtually any position
” Maintenance-free
” Optimal starting power (Dual purpose and starting applications available)

Specifications Details 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 SprialCell Technology AGM (absorbent glass mat) dual-purpose battery for marine and RV. Bluetop batteries have 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.
Model D31M
Part Number 8052-161
NSN 6.14E+12
UPC Code 8.11E+11
Open Circuit Voltage 13.1 Volts
Internal Resistance 0.0025 ohms
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
Post Type Dual SAE & 5/16 Stainless Stud
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 cycling applications and for use in vehicles with large accessory loads.
Alternator 13.65 to 15.0 Volts
Battery Charger 13.8 to 15.0 Volts, 10 amps maximum, 6-12 hours approximate
Float Charger 13.2 to 13.8 Volts, 1 amp maximum current (indefinite time at lower voltages)
Rapid Recharge Maximum voltage 15.6 volts. No current limit as long as battery temperature remains below 125 degree F (51.7 degree 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 degree F(51.7 degree C). When current falls below 1amp, finish with 3amp constant current for 1 hour. All limits must be strictly adhered to.
Nominal Voltage 12 Volts
CCA (Amps) 900



Sask Battery provides high quality 8052-161 D31M optima battery with best price and great value. Our battery comes already charged, sealed, maintenance free, and ready to install. We insures that almost 100% of the old battery can be rechargeable, recycled and protect the environment.

Optima D31M BlueTop is designed as a dual purpose battery, both starting and deep cycle for people who need a sure-starting, strong cranking, and maintenance free power source for their boat or RV, even in harsh conditions.

The unique SpiralCell design provides a strong and clean power source, ensuring the safety of you, your family and the environment. The higher reserve capacity gives you a longer shelf-life to give you the power when you need it, where you need it. This battery is designed to be used with recreational vehicles or boats with large accessory loads.

Our customer service staff will help you find the best kind of optima batteries for your need. Please call us or email us if you have any further consideration.

8052-161 D31M has the following features:

  • Battery Name : 8052-161 D31M
  • Battery Model: D31M
  • Part Number: 8052-161
  • Nominal voltage : 12 Volt
  • Dimensions: 10.25 X 6.75 X 9
  • Capacity: 75 AH (C/20)
  • Dimensions: 12.19 X 6.56 X 9.38 (Inchs)
  • Weight: 59.8 lb
  • Group size : BCI: 31
  • Cold Cranking Amps: 700 CCA
  • Cranking Amps : 875 CA
  • Reverse capacity : BCI: 155 minutes (25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off)
  • Case: Polypropylene
  • Case Color: Light Gray
  • Cover Color:  “OPTIMA“ Blue

Why you shoud choose our 8052-161 D31M:

  • Both dual-purpose and starting applications available
  • Up to 3x more recharges than other marine batteries
  • More than 15 times the vibration resistance
  • Spill-proof
  • Mountable in virtually any position
  • Maintenance-free
  • Optimal starting power (dual purpose and starting applications available)
  • Works well as a boat battery or RV battery


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8052-161 D31M

LENGTH: 12.19" HEIGHT: 9.38" WIDTH: 6.56"







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