75 A.H. Optima D31M Blue Top Battery

Optima blue top AGM batteries and AGM deep cycle batteries will keep you on the water longer. Spiral cell design of an Optima marine AGM battery with its tightly wound cells pressed into tubes, make them 15 times more resilient to vibration. Most important when you are pounding through the waves.

Our Optima marine AGM deep cycle batteries make also great start batteries also; they range from 750CCA - 900CCA. Optima marine AGM batteries and Optima marine AGM Deep cycle batteries are Spill proof they can be mounted on their side, have no terminal corrosion and do not gas under charge.

In the off season conventional batteries sulphate in 3-6 months, which is leads to premature failure. An Optima marine AGM battery or Optima Marine AGM Deep cycle battery will retain its charge for 12 months (providing zero current draw), so it is already to go for the next marine season.

Emergency services such as the Water police and some Naval departments use the Optima AGM batteries for their boats, because reliability and performance is the key

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" Blue
Group Size: BCI: 31

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: D31M
These batteries are designed for starting and deep cycling applications and for use in boats 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)

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.