Best Car Battery: 6 Brands Tested Head to Head

A car battery is the least glamorous thing you will ever buy for your vehicle, right up until the morning it will not turn the engine over. Then it becomes the only thing that matters. The problem is that every brand on the shelf promises the same thing: more cranking power, longer life, better cold starts. The price tags run from about 120 dollars to well over 220 dollars, and the marketing gives you almost nothing to go on.

So which one actually holds up when you put a meter on it? We pulled the numbers from a hands-on bench test that ran six popular batteries through the same gauntlet, and the results are a lot less flattering to the expensive options than you would expect.

Here is the short version, then the receipts.

What the testing showed

All of the measurements below come from Project Farm, who bought six car batteries and tested them the same way, back to back, on camera. You can watch the whole thing, including the freezer torture test, on the full car battery head-to-head. Everything here is pulled straight from that video.

The six batteries fell into two camps. Four were traditional flooded lead-acid batteries (EverStart, Duralast Gold, SuperStart Premium, and AutoCraft Silver, all group size 27). Two were absorbed glass mat, or AGM, batteries (Optima RedTop and DieHard Advanced Gold, both group size 3478). AGM is the newer, sealed technology that carries a big price premium, so the interesting question was whether that premium buys you anything measurable.

Each battery went through the same checks:

• Cranking amps at 75F, to see baseline output at room temperature.
• A 42 to 44 amp load test for 30 minutes, followed by an overnight rest, to measure how well each one recovers.
• A one-hour recharge at 10 amps, to see how quickly each battery takes a charge back.
• Cold cranking amps at 0F, after a full day in a freezer.
• Cold cranking amps at negative 20F, after a second day in the freezer, which is where weak batteries fall apart.

The headline result: the cheapest battery in the test was also one of the strongest.

The budget flooded battery punched above its price

The EverStart, bought at Walmart for 119 dollars and 76 cents, was the least expensive battery in the group and it turned in the best raw cold output of all six. Rated for 810 cold cranking amps, it produced 766 at 0F, which was both the highest raw number and the smallest shortfall relative to its own rating. At negative 20F it produced 708 amps, tied for the best result at that brutal temperature.

Here is the kicker from the test notes: the EverStart is made by Johnson Controls, the same manufacturer that builds the far pricier Duralast and AutoCraft batteries. You are often paying for a badge, not for better hardware.

The expensive AGM batteries did not run away with it

The two AGM batteries cost the most by a wide margin. The Optima RedTop was the single most expensive battery in the test at 224 dollars and 99 cents. AGM does have real advantages: lower internal resistance and better resistance to vibration and deep discharge. The Optima confirmed the low-resistance claim, posting the best internal resistance of the group at the coldest stage.

But raw cold output is where you feel a battery on a January morning, and there the AGM premium did not translate into a lead. At 0F the Optima produced 751 amps, strong but still behind the budget EverStart. Its overnight recovery after the load test was actually the weakest of all six. The DieHard, the other AGM battery, posted the highest room-temperature cranking amps of the group but did not separate itself once the cold set in.

How to read this for your own purchase

The test did not crown a single overall winner, and that is the honest outcome. It landed on recommendations by use case, and that is exactly how you should think about your own buy.

If your car uses a standard flooded lead-acid battery (most cars do), the takeaway is blunt: buy on price and warranty, not on brand prestige. The EverStart matched or beat batteries that cost 20 to 40 dollars more, and it shares a manufacturer with two of them. Check the group size in your owner's manual, then buy the cheapest reputable flooded battery that fits, from a store with a good free-replacement window.

If you specifically want AGM, usually because you have a start-stop system, a lot of electronics, or you live somewhere that gets seriously cold, the test leaned toward the Optima RedTop over the DieHard for buyers in freezing climates, on the strength of its cold-weather internal resistance. Just go in knowing you are paying a real premium for the sealed, vibration-tough design, not for a huge jump in cranking numbers.

A few universal rules the numbers back up:

• Match the group size to your vehicle first. A battery that does not physically fit or seat correctly is a non-starter, no matter how good it scores.
• Buy the freshest battery you can. Batteries lose capacity on the shelf, so check the date code and avoid one that has been sitting for a year.
• Weigh the warranty heavily. A longer free-replacement period is worth real money on a part that lives a hard life and eventually dies on everyone.

Want to keep comparing the gear that keeps a car running? Browse the rest of the jump starters and car power tests for chargers, jump starters, and testers that were put through the same kind of hands-on grind.