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Optima Yellow Top D31T Marine Battery 12 V Deep Cycle Auto Stereo Starting AGM


Battery Model: D31T
Part Number: 8050-160
Nominal Voltage: 12 volts
NSN: 6140 01 457 5469
Description: High power, dual purpose engine start and deep
cycle, sealed lead acid battery

Physical Characteristics:
Plate Design: High purity lead-tin alloy. Wound cell configuration utilizing proprietary
SPIRALCELL® technology.
Electrolyte: Sulfuric acid, H2SO4
Case: Polypropylene
Color: Case: Light Gray
Cover: “OPTIMA“ Yellow
Group Size: BCI: 31
Standard Metric
Length:  12.813”  325.4 mm
Width:  6.500”  165.1 mm
Height:  9.375”  238.1 mm (height at the top of the terminals)
Weight:  59.8 lb  27.2 kg








Terminal Configuration: 3/8” stainless steel stud.





Performance Data:
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)
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: D31T
These batteries are designed for starting and deep cycling applications and for use in vehicles
with large accessory loads.

Recommended Charging Information:
Alternator: 13.65 to 15.0 volts
Battery Charger (Constant Voltage): 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.
Recharge Time: (example assuming 100% discharge – 10.5 volts)
Current Approx. time to 90% charge
100 amps  52 minutes
50 amps  112 minutes
25 amps  210 minutes



Recharge time will vary according to temperature and charger characteristics. When using
Constant Voltage chargers, amperage will taper down as the battery becomes recharged. When
amperage drops below 1 amp, the battery will be close to a full state charge.
(All charge recommendations assume an average room temperature of 77°F, 25°C)
Always wear safety glasses when working with batteries.

NO INTERNATIONAL SHIPPING.  ONLY AVAILABLE TO SHIP TO THE LOWER 48 STATES. 

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