OPTIMA YellowTop Charging Information

The following charging methods are recommended to insure a long battery life - always use a voltage-regulated charger, with voltage limits set as described below.

YellowTop Type: D51 & D51R - D35 - D75/25 - D34 - D34/78
These batteries are dual-purpose. They are designed for engine start and cyclic applications and for use in vehicles with large accessory loads.

Recommended charging information:

• 13.65 to 15.0 volts, no amperage limit.

• 13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

• 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.

• Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below 1 amp.

• 13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

• 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 gasses to escape, resulting in premature failure. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.
• Failure to fully charge a battery can result in poor performance and a reduction in capacity.

OPTIMA Commercial YellowTop Charging Information

YellowTop Type: D31A & D31T
These batteries are dual purpose. They are designed for engine start and deep-cycle applications for use in vehicles with large accessory loads.

Recommended charging information:

• 13.65 to 15.0 volts, no amperage limit.

• 13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

• 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.

• Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below 1 amp.

• 13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

• 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 gasses to escape, resulting in premature failure. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.
• Failure to fully charge a battery can result in poor performance and a reduction in capacity.

OPTIMA BlueTop Charging Information

The following charging methods are recommended to insure a long battery life - always use a voltage-regulated charger, with voltage limits set as described below.

BlueTop Type: 34M
These batteries are designed for engine starting applications. They are NOT recommended or warranted for use in deep cycle applications.

Recommended charging information:

• 13.3 to 15.0 volts, no amperage limit.

• 13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

• Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below 1 amp.

• 13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

BlueTop Type: D34M / D31M/ D27M
These batteries are dual purpose. They are designed for engine starting and deep cycling applications and for use in boats with large accessory loads.

Recommended charging information:

• 13.65 to 15.0 volts, no amperage limit.

• 13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

• 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 for D34M and 3 amp constant current for 1 hour for D31M.

• Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below 1 amp.

• 13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

• 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 gasses to escape, resulting in premature failure. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.
• Failure to fully charge a battery can result in poor performance and a reduction in capacity.

OPTIMA RedTop Charging Information

The following charging methods are recommended to insure a long battery life - always use a voltage-regulated charger, with voltage limits set as described below.

RedTop Type: 34 & 34R - 34/78 - 78 - 6V - 25 & 35 - 75/25
These batteries are designed for engine starting applications. They are NOT recommended or warranted for use in deep cycle applications.

Recommended charging information:

• 13.3 to 15.0 volts, no amperage limit.

• 13.8 to 15.0 volts, 10 amps maximum, 6-12 hours approximate.

• Maximum voltage 15.6 volts (regulated), no current limit as long as battery temperature remains below 125°F (51.7°C). Charge until current drops below 1 amp.

• 13.2 to 13.8 volts, 1 amp maximum current, time indefinite (at lower voltage).

• 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 gasses to escape, resulting in premature failure. These gasses are flammable! You cannot replace water in sealed batteries that have been overcharged. Any battery that becomes very hot or makes a hissing sound while recharging should be disconnected immediately.
• Failure to fully charge a battery can result in poor performance and a reduction in capacity.