Description
| Model | Voltage |
CCA (Amps) |
Ah (@ C20) |
RC (in mins) |
Weight (kg) |
Terminals |
Dimensions** (L x W x H)(mm) |
| 34M |
12 |
800 |
50 |
110 |
17.5 |
Dual – |
254x171x199 |
| D34M |
12 |
750 |
55 |
120 |
19.6 | Dual – |
254x171x199 |
| D27M |
12 |
800 | 66 | 140 | 24.4 | Dual – |
309x173x222 |
| D31M |
12 |
900 | 75 |
155 | 27.3 |
Dual – |
329x171x238 |
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 |
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 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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