The YELLOWTOP high-performance AGM battery is one of the few true dual-purpose automotive batteries available. With premium cranking power and impressive cycling capability, this heavy-duty battery is also perfect for modern accessory-loaded vehicles.

Optima YELLOWTOP 8040-218 OPT-D35 (Group 35) Dual-Purpose Battery. The YELLOWTOP high-performance AGM battery is ideal for trucks with winches, vehicles with high-demand electronics and audio systems, commercial vehicles and heavy equipment.

Load Test Your Optima Battery You can load test it by going to an auto parts store (they all have battery testers nowadays) or do it yourself with a multimeter. We load test it by hooking it up to a vehicle and checking the voltage while running the starter.

A red top will probably better handle the extreme loads of a winch, since it's a starting battery. Like Scott said, the yellow top is better for those long-term, slow drain type loads that might drain your battery to zero before getting recharged.

Have a 3x longer lifetime compared to traditional lead-acid batteries. Performs incredibly well in extreme environments with a wide range of operating temperatures. Optima batteries are completely sealed, non-spillable and maintenance-free. Mounting options are endless for custom applications.

AGM batteries All OPTIMA batteries are AGM batteries, but no OPTIMA batteries are gel batteries. The "g" in "gel" often gets confused with the "G" in AGM.

KEY BENEFITS:

• Impressively high cranking characteristics in a small battery.
• Higher charge acceptance during AGM battery charging.
• Sealed maintenance-free design.
• Virtually spill-proof.
• Shock and vibration-resistant.
• More power per pound as compared to standard batteries.
• Long service life.

When the probes touch the terminals while the car is off and the battery is resting, the multimeter display should show a reading of 12.2 to 12.6 volts (full charge). This voltage range means the battery is in good condition for starting the vehicle.

We simply need to select the dc. Function on our multimeter. And then we connect the red lead to the positive terminal and the black lead to the negative. This will give us a voltage. Reading.

Optima batteries have proven themselves time and time again to be the absolute best on the market for high-performance battery solutions. With batteries to fit most vehicles, they have a solution for any application.

Resistant to All Damaging Factors: They are corrosion resistant and ideal for all types of weather and temperatures. Over 15X More Vibration Resistance: Damage from vibration can cause battery failure, but Optima cells are tightly compressed to withstand even the most severe vibration conditions.

AGM Optima batteries are known as compact batteries with a large capacity. This type of battery is equipped with the Spiralcell AGM technology (rolled lead), resulting in a considerably longer lifespan than conventional batteries.