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3 Best AGM Batteries (Review and Buying Guide)

Brace yourself for some cold autumn mornings! And of course, you’ll want to make sure your car’s ready as well. So what better way to do so than with the unrivaled CCA of an AGM battery?

These batteries will start your car on even the coldest of mornings. And if that’s not good enough, they leave no messes or leaks behind. Sound like a good deal? Then let’s find the best AGM battery for your car!

Overview of the Top AGM

 Optima Batteries 8004-003
Optima Batteries 8004-003 34/78 RedTop Starting Battery
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Optima Batteries OPT8020-164
Optima Batteries OPT8020-164 35 RedTop Starting Battery
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Odyssey 35-PC1400T
Odyssey 35-PC1400T Automotive and LTV Battery
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priceOptima Batteries 8004-003 Batteries OPT8020-164Odyssey 35-PC1400T
Dimensions10 x 6.9 x 7.8 inches
9.3 x 6.8 x 7.6 inches
13.5 x 11 x 9.8 inches
Weight38.8 pounds
31.7 pounds
50 pounds
Reserve Capacity100 minutes90 minutes130 minutes
Lifespan (AVG/ Not Official)2 years (much more with good care)Lasts about 1-2 years (longer with good care)About 3-10 year

AGM Battery Reviews

Optima Batteries 8004-003 34/78 RedTop Starting Battery

Optima Batteries 8004-003 34/78
Optima Batteries 8004-003 34/78 RedTop Starting Battery
3.9 out of 5 stars (3.9 / 5)
Optimal 34/78 Battery is a great starting battery. With its high power, starting ability, and leak-proof, the battery is perfect for heavy use.

Here’s an Optima AGM that seemingly does it all! Packing high CCA, respectable reserve capacity, and plenty of durability, it’s ideal for most cars out there.

At a Glance

  • 12-volt
  • 800 CCA
  • 10” x 6 78” x 7 1316”
  • 38.8 lbs
  • Vibration resistant
  • Maintenance-free
  • 100 min reserve capacity
  • The lifespan of about 2 years (more with good care)
Best Optima Batteries 8004-003 34/78 RedTop Starting Battery
Ideal for trucks, streetcars, SUVs, hot rods, and any other application.

Take a look at the specs above, and you’ll find this battery works great for most situations. But what those specs don’t show is how durable this battery is. We took it to the track and found it handled hard launches like a pro. No spills or dents in sight! Likewise, it’ll handle your off-roading needs just fine as well!

Something else that’s interesting to note here is that this battery is super easy to install. We tried three different cars, and each time it took a matter of seconds. So even if you’ve never replaced a gasket, you’ll fit this AGM in your car with ease!

One final note about this battery is that it’s perfect for your nicest show cars. During our tests, we found this battery could last months at a time without needing a trickle charge. So it’s great for that Challenger you only take out on the sunny weekends.


  • Great for Non-dailies (no trickle charge)
  • Strong reserve capacity
  • Easy to install
  • Durable
  • Solid amount of CCA for cold days.


  • Lifespan isn’t great
  • Terminals are awkwardly positioned for some cars

What is it Used For?

The Optima 34/78 is a great starting battery!

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Optima Batteries OPT8020-164 35 RedTop Starting Battery

Optima Batteries OPT8020-164
Optima Batteries OPT8020-164 35 RedTop Starting Battery
3.8 out of 5 stars (3.8 / 5)
Starting your car with Optima Batteries OPT8020-164 35 RedTop is really ideal!

Here’s a battery that proves great things come in small packages. The Optima 35 RedTop’s compact size allows it to fit easily in most cars. But don’t let its size fool you. This battery also packs plenty of cranking power when it needs to!

At a Glance

  • 12-volt
  • 720 CCA
  • 9.38” x 7.69” x 6.75”
  • 31.7 lbs
  • 90-minute reserve capacity
  • Lasts about 1-2 years (longer with good care)
Optima Batteries OPT8020-164 35 RedTop Starting Battery
The Optima Batteries OPT8020-164 battery, which is built for every road use, can work well at the ultra-low temperature.

Looking at this AGM’s size, you’ll notice it’s smaller than most other batteries on the market. So it’ll easily fit in a handful of cars. You’ll even get an adapter for easy height adjustments as well. This piece alone allowed us to snugly fit this battery inside a ’93 Mazda RX-7 with ease.

We also noticed that this battery felt like it offered more cranking amps compared to other batteries we’ve tested. It did an epic job of starting up our cars and keeping them going. So it’s definitely great even if you don’t live in a cold climate area!

Lastly, this AGM is without a doubt spill-proof, even more so than other AGMs. While not our most prideful moment, we hit our fair share of curbs and even a tire while testing. And each time, we noticed the battery never leaked or spilled. Even on a hot summer day, this battery never even made a trace of a mess!


  • Easy to recharge
  • Spill-proof in every sense of the word
  • Small in size
  • Exceptional cranking power
  • No messes or leaks


  • Lower CCA compared to other AGMs
  • Battery life could be better

What’s it Used For?

The Optima 35 RedTop is a starting battery.

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Odyssey 35-PC1400T Automotive and LTV Battery

Odyssey 35-PC1400T
Odyssey 35-PC1400T Battery
4.4 out of 5 stars (4.4 / 5)
This item, Odyssey 35-PC1400T, is built for starting vehicles and other appliances.

Now here’s a battery that’s packing the power! Even by AGM standards, the CCA and reserve capacity are simply ridiculous here. And that’s a good thing!

At a Glance

  • 12-volt
  • 13.5” x 11” x 9.8”
  • 50 lbs
  • 850 CCA
  • 130-minute reserve capacity
  • about 3-10 year lifespan
Cheap Odyssey 35-PC1400T
Providing twice as much power as a conventional battery.

Just look at those specs and you’ll find a freakish amount of CCA and reserve capacity here. Seriously, our car started instantly on a Colorado winter evening with no issues throughout the drive. So it’s a safe bet that it’ll do the same wherever you drive.

Also, this battery works great in cars with tons of after-market electronics. We tried it with a 3-amp bass system and noticed no light flickering. In fact, there were no electrical problems of any type. This becomes all the better when you factor in that high reserve capacity! Hence there’s plenty of room for fun here.

And lastly, you’ll get a reliably long lifespan with this battery. Take good care of it, and it’ll last every bit of 3 years and plenty more! So it’s definitely one of the longer lifespans compared to other AGMs.


  • Huge amount of CCA
  • Long lifespan
  • Super-long reserve capacity
  • Great for electronics
  • Decent Crank Power


  • Needs more time and amps to recharge
  • Heavy and bulky

What’s it Used for?

The Odyssey 35-pc 1400T is a starting battery.

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Which AGM Battery Reigns On Top? Recommended: The Optima Battery 8004-003 34/78 RedTop!

There’s no denying that all three of the above AGMs will offer something great for your car. And in truth, you could make a case for buying any of them. But if we’re being honest here, one stood out above the rest by a slight margin.

So, the winner is… *cue dramatic drumroll*

The Optima Battery 8004-003 34/78 RedTop!

It’s really hard to ignore a battery that excels at everything a good AGM should do! Seriously, you’re getting enough CCA to power your car through any winter morning here. And its durability is more than enough for any drive you make.

Honestly, we can’t say enough good things about this battery. So whether you want to go off-roading in the snow, or own a battery that’s reliably there for you, the Optima 34/78 RedTop is a great choice!

Finding the Best AGM Battery

Before we take a look at the market’s best AGM batteries, let’s answer the first question on your mind. How do you know if it’s a good AGM battery in the first place?

Thankfully, we’ve got the answer right here in this buying guide. So here are some specs and features to prioritize when shopping for a car battery.

What are CCAs and How Many Do You Need?

CCA is an abbreviation for cold cranking amps. And the name really says it all. This value is what determines how well your battery starts your car in below-freezing temperatures. So it’s exactly what you’ll need for driving in these upcoming autumn and winter months.

As far as exact amounts go, it’ll vary. If you plan to drive your car in the cold weather, then you’ll want at least 700 or so. However, if you don’t plan to drive your car during bone-chilling times then this number is downright negligible.

Should You Opt For a High Reserve Capacity?

This one’s entirely up to you! But big numbers certainly won’t hurt! Especially for those times you leave your lights on during a grocery run. And you’ll definitely be thankful you have it the next time your friend makes a “quick” 7/11 run that lasts 45 minutes.

As a rule of thumb, 60 minutes is a good starting point. This way, you’ll have something to do anytime you need to wait in your car.

Is There a Right Battery Size for Your Car?

Much like all your other essentials, your car needs a certain battery size called a group. Don’t worry though, it’s pretty easy to find. Just check for the number on your current battery. And if that doesn’t work, consult your car’s manual.

If the above two don’t work, keep in mind that each size usually fits certain manufacturers. So your 34/78 is great for GM and Chrysler. Meanwhile, 35 is a great size for JDMs like Subaru and Nissan.

Maintenance-Free Makes Life Easy

Are you sick of your battery’s upkeep? Then opt for a maintenance-free!

These pack enough acid and chemicals to last your battery’s lifespan. So you might need to add some water from time to time. But they won’t require you to dirty your hands in any way! And once they run out of acid and chemicals, simply replace the battery.

Do You Need Special Batteries for Off-Roading?

The short answer is yes. But most of your AGMs have you covered. After all, they won’t really leak or make a mess when hitting a few bumps. However, it’s always best to check a battery’s durability before you climb some boulders with it.

What’s so Great About an AGM?

Also known as absorbed glass mats, these batteries are stellar for most cars out there!

For starters, they usually pack copious amounts of CCA to ensure your car starts perfectly in the cold weather. And even if you don’t live in a cold climate, AGMs are ideal for your non-dailies. So feel free to store that ’63 Nova away until car show season without needing to trickle charge in most cases.

Speaking of recharging, keep in mind that AGMs will generally do that faster than flooded batteries. And if that’s not enough, AGMs are designed in such a way that spilling, leaking, and corrosion are not issues! So you won’t need to clean up too many messes here.

And this is just the start of everything great AGMs (Sealed Absorbed Glass Mats) do for your car. Thus, there’s plenty of reasons you’ll want one.

Don’t Delay: Buy Your AGM Now!

Autumn and winter are right around the corner! So with cold days ahead, you’ll need a battery that can either get your car started or keep it fresh during its hibernating months.

So, with little time left, pick up your high CCA AGM battery now! You won’t regret your choice once you experience this battery’s performance for yourself!

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