Duralast Gold vs Diehard Gold Car Battery

The main difference between Duralast Gold and Diehard Gold batteries is the battery technology. Duralast Gold uses a traditional flooded lead-acid design while Diehard Gold uses absorbed glass mat (AGM) technology.

Diehard Vs Duralast Table

We will compare the two batteries and help you decide which best fits your needs.

DieHard Gold Duralast Gold
Price: $214.99 Price: $209.99
Warranty: 3 years free replacement Warranty: 3 years
Battery Group Size 35 Battery Group Size 35
Cold Cranking Amps: 640 CCA Cold Cranking Amps: 640 CCA
Cranking Amps: 800 CA Cranking Amps: 800 CA
Reserve Capacity: 100 minutes Reserve Capacity: 130 minutes
Height: 8.875 in Height: 8.88 in
Length: 9.062 in Length: 9.06 in
Width: 6.937 in Width: 6.94 in
Weight: 39.01 lbs Weight: 38.2 lbs

Battery Technology

Duralast Gold batteries utilize a conventional flooded lead-acid design where the electrolyte fluid inside the battery is not sealed or contained. This makes it require more maintenance like checking water/fluid levels occasionally.

In contrast, Diehard Gold batteries use absorbed glass mat (AGM) technology. In AGM batteries, the electrolyte is absorbed into a glass mat separator between the battery plates which immobilizes the electrolyte.

This makes AGM batteries maintenance-free since there is no need to check fluid levels. The immobilized electrolyte also provides increased resistance to vibration and shock.


Duralast Gold batteries come with a 3-year free replacement warranty while Diehard Gold batteries have a 3-year free replacement warranty. Both offer the same nationwide coverage for 3 years.

Group Size

Both Duralast Gold and Diehard Gold batteries are available in BCI Group Size 35 which will fit most modern full-sized pickup trucks, SUVs, and vans. This group size is commonly used in vehicles with V8 engines.

Cold Cranking Amperage

The cold cranking amps indicate the battery’s ability to start an engine in cold temperatures. Duralast Gold has 640 cold cranking amps while Diehard Gold provides 640 cold cranking amps. Both batteries offer ample starting power even in extreme cold weather.

Cranking Amperage

Cranking amps measure how much current a battery can deliver for 30 seconds at 32°F while maintaining at least 1.2 volts per cell. The Duralast Gold battery provides 800 cranking amps versus 800 cranking amps for the Diehard Gold.

Reserve Capacity

The reserve capacity indicates how long a battery can continuously deliver 25 amps at 80°F before dropping below 10.5 volts.

Duralast Gold has a reserve capacity of 130 minutes compared to 100 minutes for Diehard Gold. The Duralast has a longer reserve capacity.


The Diehard Gold is more expensive at $214.99 while the Duralast Gold costs $209.99. The AGM technology and brand name contribute to the Diehard’s higher price point.

Terminal Location

Both batteries have a standard top terminal layout. The positive terminal is located on the top right front and the negative terminal is located on the top left front.


The Duralast measures 6.94 x 9.06 x 8.88 inches (W x L x H). The Diehard has similar dimensions of 6.937 x 9.062 x 8.875 inches. They will fit in most vehicles needing a group size 35 battery.


The Diehard Gold weighs 39.01 lbs while the Duralast Gold weighs 38.2 lbs. There is only a minor 0.8 lb difference in weight between the two.


Both the Duralast and Diehard are 12V batteries, the typical voltage for most passenger vehicle starting batteries.

Additional Features

An advantage of the AGM technology used in the Diehard Gold battery is its increased resistance to vibration and shock compared to the conventional flooded lead-acid design of the Duralast Gold.

Diehard Gold batteries also contain a minimum 94% recycled lead and plastic content versus an unknown percentage for Duralast Gold.

Our Observation
The DieHard Gold battery offers superior starting power with 640 CCA and a 100-minute reserve capacity. It uses a stamped grid design that is corrosion-resistant for increased durability.

With a 3-year free replacement warranty, the DieHard Gold seems to be the best option. The Duralast Gold offers slightly less CCA at 640 but has a 3-year warranty.

However, it uses a traditional flooded lead-acid design that requires more maintenance. We recommend the DieHard Gold for its higher performance, durability, and hassle-free maintenance.

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