Optima D31 Yellow Top Battery
The Hardest Working Battery

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OPTIMA's YellowTop last up to twice as long as traditional batteries, so if you rely on your vehicle to earn a living, you demand consistent high performance from all the parts you put into it. Unexpected downtime due to a battery failure can waste time and money and put you behind schedule. OPTIMA YellowTop batteries are made to endure the extremes of commercial, heavy duty use and keep you moving. NONSPILLABLE AND MAINTENANCE FREE OPTIMA batteries are completely sealed and maintenance free, providing a solution for applications where flexibility in mounting is needed.

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: 6.5" 165.1 mm

Height: 9.375" 238.1mm (height at the top of the terminals)

Weight: 59.8 lb
27.2 kg


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)
Nominal Voltage: 12 volts
NSN: 6140 01 502 4973

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: D31A
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.

Always use a voltage regulated battery charger with limits set to the above ratings.

Overcharging can cause the safety valves to open and battery gases to escape, causing premature end of life.

These gases are flammable!

You cannot replace water in sealed batteries that have been overcharged.

Any battery that becomes very hot while charging should be disconnected immediately.

Not fully charging a battery can result in poor performance and a reduction in capacity.

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