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: 34

                        Standard                          Metric
Length:                10.”                       254 mm
Width:                6.875”                     174.6 mm
Height:                7.813”                  198.4 mm (height at the top of the terminals)
Weight:               43.5 lb.                    19.8 kg

Terminal Configuration: SAE / BCI automotive and threaded stainless steel stud 5/16 – 18 UNC.

Performance Data:

Open Circuit Voltage (fully charged): 13.1 volts

Internal Resistance (fully charged): 0.0028 ohms

Capacity:55 Ah (C/20)

Reserve Capacity:BCI: 120 minutes (25 amp discharge, 80°F (26.7°C), to 10.5 volts cut-off)

Power: CCA (BCI 0°F): 750 amps
          MCA (BCI 32°F): 870 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: D34M

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 2 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                          35 minutes
50 amps                            75 minutes
25 amps                            140 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.