Diehard Battery Review


DieHard batteries are best known for their ability to power both on-road and off-road vehicles, making them a surefire choice for those who need a reliable car, RV, or boat powering option that’s still both long-lasting, and reasonably priced. By sticking to DieHard, you can guarantee all of these and make your purchasing experience much faster and simpler.

I’ve made this process even easier for you by picking five of my favorite DieHard batteries and reviewing them below, providing not only a small writeup about the products themselves but a pros and cons list that allows you to see the properties of each battery in an easiest-to-read format.

If reading more into the topic is your thing, however, I’ve gathered some information about these batteries into a buyers’ guide at the bottom of this article. This shows my rationale for how I’ve judged these products, breaking them down into the sum of their parts and explaining what makes certain components more desirable than others.

Best Overall Diehard Battery
Runner Up
Best Budget Diehard Battery
Best Reserve Capacity in its Class
Best Amp Hours and Reserve Capacity
DieHard 38232 Advanced Gold AGM Battery - Group 34
DieHard 38188 Group 34R lead_acid_battery
DieHard 38275 Group 35 lead_acid_battery
DieHard 50748 Group 48 lead_acid_battery
DieHard 38217 Group 49 lead_acid_battery
DieHard 38232 Advanced Gold AGM Battery - Group 34
DieHard 38188 Group 34R lead_acid_battery
DieHard 38275 Group 35 lead_acid_battery
DieHard 50748 Group 48 lead_acid_battery
DieHard 38217 Group 49 lead_acid_battery
Amp Hours
55 hrs
55 hrs
50 hrs
70 hrs
92 hrs
Reserve Capacity
120 min
120 min
100 min
120 min
170 min
Cold Cranking Amps
775 CCA
775 CCA
650 CCA
760 CCA
850 CCA
Best Overall Diehard Battery
DieHard 38232 Advanced Gold AGM Battery - Group 34
DieHard 38232 Advanced Gold AGM Battery - Group 34
Amp Hours
55 hrs
Reserve Capacity
120 min
Cold Cranking Amps
775 CCA
Runner Up
DieHard 38188 Group 34R lead_acid_battery
DieHard 38188 Group 34R lead_acid_battery
Amp Hours
55 hrs
Reserve Capacity
120 min
Cold Cranking Amps
775 CCA
Best Budget Diehard Battery
DieHard 38275 Group 35 lead_acid_battery
DieHard 38275 Group 35 lead_acid_battery
Amp Hours
50 hrs
Reserve Capacity
100 min
Cold Cranking Amps
650 CCA
Best Reserve Capacity in its Class
DieHard 50748 Group 48 lead_acid_battery
DieHard 50748 Group 48 lead_acid_battery
Amp Hours
70 hrs
Reserve Capacity
120 min
Cold Cranking Amps
760 CCA
Best Amp Hours and Reserve Capacity
DieHard 38217 Group 49 lead_acid_battery
DieHard 38217 Group 49 lead_acid_battery
Amp Hours
92 hrs
Reserve Capacity
170 min
Cold Cranking Amps
850 CCA
DieHard 38232 Advanced Gold AGM Battery - Group 34

My top pick is the DieHard 38232, or more specifically the DieHard Advanced Gold AGM GP 34. It’s a 55 amp hour battery, more than double the 20 amp hour batteries that you can find elsewhere on the market.

You’ll be seeing AGM-type batteries a lot from DieHard. This means Absorbed Glass Mat which, for the consumer, tells you that it has a lower maintenance cycle than other batteries usually do, you won’t need to keep refilling it with water every month or so, making it great for those who don’t use their vehicles regularly too.

A big factor in what makes these a great buy is their longevity. Getting more out of a battery is a great way of saving consumers money while justifying the price point of the battery itself, so it’s not surprising that many batteries try to last longer than their competitors. The DieHard Advanced Gold has features that allow it to do just that.

Firstly, it has power optimization in its full-frame positive and negative plates, meaning that electrical shorts are better prevented. Electrical shorts are guaranteed to kill the lifespan of your batteries, so it’s a good reassurance that shorting these batteries out is much less likely than it may have been with other brands.

Secondly, these batteries feature up to twenty times more vibration protection than your average lead-acid batteries, almost doubling the longevity of these models to not only add to the performance you can get out of them over their lifetime, but it also makes these a great cost-effective purchase for those who want to make their cash stretch furthest.

Even if you need power when your charger connection is not available, these batteries have a longer-than-average reserve capacity that lasts for two whole hours, giving you more use out of them when you may be needing it most. Other design elements built into the 38232 Advanced Gold batteries to keep them working are their spill-proof constructions and the enhanced electrolyte suspension system. 

The first is fairly self-explanatory, the casing of these batteries is designed in such a way that it can handle accidental spills without the sophisticated electronic equipment inside getting destroyed or otherwise damaged. The enhanced electrolyte suspension system protects these same internal components by absorbing excess electrolytes, meaning they get less worn down in their day to day use and generate satisfying levels of power for longer.

If all of the above wasn’t enough to persuade you, maybe you’ll feel safer knowing that your purchase will also be protected by a three-year free replacement warranty should any problems arise with your purchase.

Pros
  • Optimized power frame positive and negative plates stop damaging electrical shorts.
  • 20 times vibration protection safeguards this battery’s longevity.
  • Long 120-minute reserve capacity.
  • Spill-proof casing protects the battery from external threats and accidents.
  • Enhanced electrolyte suspension keeps the inner workings of these batteries protected.
  • 55 Amp hours
Cons
  • It may need special fitting since it’s smaller than a lot of standard batteries.
DieHard 38232 Advanced Gold AGM Battery - Group 34
  • 20X more vibration protection safeguards battery performance over time, 2X the cycle life extends the performance and life (compared to...
  • BCI Gp 34, CCA 775, RC 120 minutes, 55 AH rating
  • Spill proof design provides added protection for sophisticated electronic equipment
DieHard 38188 Group 34R lead_acid_battery

Second on my list is another DieHard battery from the Advanced Gold series, as all of the batteries on this list are, with the DieHard 38188 Advanced Gold AGM 34R Battery. It’s also rated at 55 amp hours, meaning it’s on par with our number one choice in terms of performance power.

Part of the reason it can achieve this level of power is that it’s power-optimized at both the positive and negative plates, essentially short-proofing the battery and preventing any loss of battery lifespan in the long term. Like our first option, the reserve capacity for these batteries is also a neat two hours so, should the charging system fail, you have ample time to do something about it.

The functional life cycle of these batteries is effectively doubled with DieHard’s Advanced Gold range. This is thanks to a multitude of construction elements that not only extend the life of key components but also protect those components from both internal and external threats.

On the inside, a familiar electrolyte absorbing suspension system protects core battery components from overexposure to electrolytes, which damages the power-efficiency of batteries in the long term and leads to their inevitable wear out. On the outside, its casing has been made to high heavy-duty standards, being shockproof as to keep the functional parts of the battery safe from accidental knocks and falls.

Pros
  • Power-optimized at both plates to prevent electrical shorts.
  • Two-hour reserve capacity is great for keeping you powered should your charging system fail.
  • The battery life cycle has been doubled when compared to lead-acid batteries.
  • The electrolyte absorption system purges electrolytes from core battery components.
  • Heavy-duty shock-proof construction keeps the battery safe from knocks.
  • 55 amp hours
Cons
  • Tends to have a reduced performance when used in cold weather.
DieHard 38188 Group 34R lead_acid_battery
  • 20X more vibration protection safeguards battery performance over time, 2X the cycle life extends the performance and life (compared to...
  • BCI Gp 34R, CCA 775, RC 120 minutes, 55 AH rating
  • Spill proof design provides added protection for sophisticated electronic equipment
Best Budget DieHard Battery

DieHard 38275 Advanced Gold AGM GP 35 Battery

DieHard 38275 Group 35 lead_acid_battery

Next, is the DieHard 38275 Advanced Gold AGM GP 35 Battery, this time an Advanced Gold battery from a different group. This Group 35 battery has the lowest reserve capacity of all listed at only one hundred minutes. This is still admirable, however, and only twenty minutes less than the previous two options. At any rate, it’s more than the standard reserve capacity.

Where specs are concerned, these batteries carry a 50 amp hour rating, roughly double than what many other batteries are capable of. What’s more impressive about these models is that they also last a very long time, allowing you to get as much performance and cost-efficiency out of your purchase as possible.

Like with all DieHard batteries, longevity and durability are this model’s watchwords. You’ll find it packed with many of the same features that are present in the above battery models, just that this model in particular runs slightly less powerful in exchange for a smaller price point.

It has much more vibration protection than other batteries, estimated to be about twenty times more when compared to common battery alternatives. This vibration protection works well with a heavy-duty, shock-proof construction that keeps the battery inside safe from any workplace accidents that may occur. With both of these working in tandem, external threats to this battery shouldn’t be something for you to worry about.

Where those all-important interior components are concerned, the battery system itself is made with an integrated electrolyte absorbing suspension system. This simply means that excess and stray electrolytes are kept away from the certain components that would be, albeit slowly, damaged by them. This essentially slows the wearing process to a crawl, getting more use from your battery.

It’s important to fight against this creeping damage to your batteries, but those who have had batteries short out know that it can only take a second or two to ruin your battery and send your cash spiraling down the drain. Thankfully, this model too has a power-optimization in its positive and negative frames, negating the risk of a short.

Pros
  • 20X more vibration protection than lead-acid alternatives.
  • The shock-proof casing ensures that no external knocks or shakes will loosen key components.
  • An integrated electrolyte absorbing suspension system slows down wear damage.
  • Power-optimized positive and negative frames make electrical shorts a non-issue.
  • 50 Amp Hours
Cons
  • Reserve capacity isn’t as much as the previous two suggestions.
DieHard 38275 Group 35 lead_acid_battery
  • 20X more vibration protection safeguards battery performance over time, 2X the cycle life extends the performance and life (compared to...
  • BCI Gp 35, CCA 650, RC 100 minutes, 50 AH rating
  • Spill proof design provides added protection for sophisticated electronic equipment
Best Reserve Capacity in its Class

DieHard 50748 Advanced Gold AGM GP 48 Battery

DieHard 50748 Group 48 lead_acid_battery

The DieHard 50748 Advanced Gold AGM GP 48 Battery, is a 70 amp hour rated model that achieves those numbers through the adept use of its internal volume, DieHard’s Flat-Plate AGM design increasing this battery’s power-per-pound.

As for some of the other specs, its reserve capacity allows for one hundred and twenty minutes of power after the battery charging system fails. This is about forty minutes more than you’d usually find with batteries of this caliber, and you can use this extra time to either repair your charging system or find a safe place to stop and seek assistance.

Inside, electrolyte absorbing suspension is used to keep electrolytes away from the more sensitive components of the battery which, in inferior models, degrade the performance of your battery over time. This enables your battery to work like it’s its first day of use when you’re long into the battery’s lifespan.

When it comes to outside interference, the battery has shock absorption capabilities that not only reduce vibrations by about twenty times when compared to similar batteries. This is handy since these micromovements sap power and interfere with battery performance. The same feature also makes it shock-proof to more aggressive stimuli like knocks.

Pros
  • DieHard’s Flat-Plate AGM design increases this battery’s power-per-pound.
  • 120-minute reserve capacity keeps your options open should your charging connection fail.
  • Interior electrolyte suspension system reduces gradual battery performance degradation.
  • Shock absorption reduces vibrations by 20X.
  • 70 Amp hours
Cons
  • Requires protrusion cutting if used with a POS cable.
DieHard 50748 Group 48 lead_acid_battery
  • 20X more vibration protection safeguards battery performance over time, 2X the cycle life extends the performance and life (compared to...
  • BCI Gp 48, CCA 760, RC 120 minutes, 70 AH rating. It ensures the proficient use of internal volume for more power-per-pound through the...
  • Spill proof design provides added protection for sophisticated electronic equipment. Top terminal post location
Best Amp Hours and Reserve Capacity

DieHard 38217 Advanced Gold AGM GP 49 Battery

DieHard 38217 Group 49 lead_acid_battery

Last but not least is the DieHard 38217 Advanced Gold AGM GP 49 Battery, a very high rated option at 92 amp hours, providing a great performance baseline for those in need of raw power.

With this added power, it’s no surprise that the reserve capacity for this battery is high too at one hundred and seventy minutes. That’s nearly three hours of usable spare power capacity should your charging system fail.

These batteries can keep functioning at 0 degrees Fahrenheit so if you’re in need of a product that can survive below-freezing temperatures, you’ve found it. In general, it’s made to withstand most that nature will throw at it. The casing of the battery is made of tamper-resistant material that’s heat-sealed, making the box functionally shock- and spill-proof to protect the equipment inside from accidental damage.

As for the battery interior, it optimizes power in its positive and negative plates to prevent critical technical failures that could ruin the longevity of these batteries, and sometimes even cut their lives short.

Despite all of its features, it’s a smaller battery than others. While great for those looking for a compact setup, it can cause some trouble when fitting in certain vehicles, and will likely require added securing to keep it in place.

Pros
  • High performance 92 AH, 170-minute reserve capacity battery.
  • Battery is capable of functioning at 0 degrees Fahrenheit.
  • Optimized power in positive and negative plates prevent technical failure.
  • Heat-sealed casing made of tamper-resistant material keeps the battery contents safe and protected.
Cons
  • Battery is smaller than others, so it may have fitting issues.
DieHard 38217 Group 49 lead_acid_battery
  • 20X more vibration protection safeguards battery performance over time, 2X the cycle life extends the performance and life (compared to...
  • BCI Gp 49, CCA 850, 92 AH rating. Reserve Capacity (RC):170 ; Cold Cranking Amps (CCA at 0 deg.F):775
  • Spill proof design provides added protection for sophisticated electronic equipment

Buyers’ Guide – How to find a great battery

This buyers’ guide is here to show you what’s what when it comes to batteries. Finding the best battery for your needs, whether it’s DieHard or another brand, is simple when you know what to look for. I’ll show you exactly what to look for by breaking down these batteries into their parts and explaining how and why certain features are better than others.

I’ve split this section into four parts, the battery’s type and size, performance, life, and the accompanying warranty, if one applies.

Battery Type and Size

The two main types of batteries for cars and watercraft are lead-acid batteries and AGM batteries. As mentioned above, all of the DieHard batteries in our list are Absorbed Glass Mat (AGM) batteries, so chances are you’ll be leaning heavily toward AGM options. The types of battery function differently depending on how you’ll be applying them. 

Lead-acid batteries require water changes so that the electrolyte water solution keeps it powered. They’re generally lower priced than AGM batteries, often to a significant degree, but this is a tradeoff since they don’t tend to be as powerful as AGMs. Those performance shortcomings are why I’d recommend you set some cash aside for AGM batteries instead.

Absorbed Glass Mat (AGM) batteries are the more modern battery systems available and are known for their charging capacity. They also hold a charge for longer, which is very important when deciding on which batteries to buy and is even better for those who don’t use their vehicles for long periods.

As for its size, this will depend on your vehicle. Make sure you know the size of your vehicle’s battery compartment, either through an industry designation or through raw dimensions. Try and match these with your prospective battery choice, paying attention to the width, height, and length of your battery and the hole it’s supposed to fit in. 

You want to be careful when installing a battery since, if you force a larger battery into a smaller hole, you’ll likely violate your warranty guideline. If you haven’t got any experience with measuring batteries and similar mechanical items, then you can get the assistance of your local mechanic.

Battery Performance

You want your batteries to have a great performance, otherwise, there’s little point in having them. First, you should clear up whether your vehicle can be powered by the battery you want. You can get a more powerful battery too, of course, but we’d suggest that you not go overboard since powerful batteries need equally powerful chargers, and these will be unnecessary expenses when a lower powered battery will do.

Amp Hours

Amp hours are a rating of how much energy is stored in a battery. The higher the number the longer than battery will last between charges.

My first two battery picks, the DieHard 38232 and the DieHard 38188, both have amp hour ratings of 55 Amps. This means these batteries can provide 55 amps of current for 20 hours at 80 deg F before falling below 10.5 volts.

Of course, 80 deg F is quite warm so if the temperature is a cooler or even cold your battery will not last nearly as long before dropping below 10.5 volts.

Reserve Capacity

RC is an important metric to look at, too. RC is reserve capacity, which is how long your battery can keep supplying power after the charging system fails for whatever reason. The average RC is about ninety minutes, or an hour and a half, but DieHard batteries are known for having RCs that exceed this number.

If you are shopping for specifically DieHard batteries, we’d say to only get those with a minimum of one hundred and twenty minutes of reserve capacity. Since it’s handy in tricky or even emergency situations, it’s great to have a generous reserve capacity and not need it than need but not have it.

Cold Cranking Amps

You may wish to pay attention to the CCA of a battery too. This is the Cold Cranking Amps, which means how much power is required to start the an engine at cold temperatures.

The higher the number the more amps a battery can deliver at cold temperatures. The rating refers to how many amps the 12 volt battery can deliver for 30 seconds while maintaining a minimum voltage of 7.2 volts at 0 deg F.

So for a 12 Volt battery with 775CCA like my top choice, the DieHard 38232, it can provide 775 Amps for your engine to start for 30 secs when the temperature is 0 deg F and will maintain a voltage of at least 7.2 volts.

Battery Life

As I said above, longevity is pretty important for batteries. The candle that burns twice as bright lasts half as long, and that’s a pretty weak setup where batteries are concerned. Having a lower but consistent power supply is infinitely more desirable than having a short burst of power that won’t last very long, not to mention it’s more expensive.

Standard batteries will last about two to three years, hence why many warranties will have that period of time as an expiration limit to them.

As a side note, it’s best to buy as fresh a battery as you can. Manufacture dates should be made known on the product listing page and the battery itself. Brand new is preferable but, if you are buying older ones, never buy batteries that exceed six months in age. At that point, the investment into the battery won’t be worth it.

Warranty

Most batteries will come with some sort of warranty, the DieHard options above included. We’d say the minimum warranty you should accept is twenty-four months, but a prorated warranty that lasts for a staggering eighty-four months is preferable. 

If you do get a warranty, familiarize yourself with the violation guidelines so you can avoid them and ensure your purchase remains covered. This will involve the care put into battery installation and the water levels in your batteries.

All the Gold level batteries from DieHard include a 3 year warrenty.

Best Overall Diehard Battery
Runner Up
Best Budget Diehard Battery
Best Reserve Capacity in its Class
Best Amp Hours and Reserve Capacity
DieHard 38232 Advanced Gold AGM Battery - Group 34
DieHard 38188 Group 34R lead_acid_battery
DieHard 38275 Group 35 lead_acid_battery
DieHard 50748 Group 48 lead_acid_battery
DieHard 38217 Group 49 lead_acid_battery
DieHard 38232 Advanced Gold AGM Battery - Group 34
DieHard 38188 Group 34R lead_acid_battery
DieHard 38275 Group 35 lead_acid_battery
DieHard 50748 Group 48 lead_acid_battery
DieHard 38217 Group 49 lead_acid_battery
Amp Hours
55 hrs
55 hrs
50 hrs
70 hrs
92 hrs
Reserve Capacity
120 min
120 min
100 min
120 min
170 min
Cold Cranking Amps
775 CCA
775 CCA
650 CCA
760 CCA
850 CCA
Best Overall Diehard Battery
DieHard 38232 Advanced Gold AGM Battery - Group 34
DieHard 38232 Advanced Gold AGM Battery - Group 34
Amp Hours
55 hrs
Reserve Capacity
120 min
Cold Cranking Amps
775 CCA
Runner Up
DieHard 38188 Group 34R lead_acid_battery
DieHard 38188 Group 34R lead_acid_battery
Amp Hours
55 hrs
Reserve Capacity
120 min
Cold Cranking Amps
775 CCA
Best Budget Diehard Battery
DieHard 38275 Group 35 lead_acid_battery
DieHard 38275 Group 35 lead_acid_battery
Amp Hours
50 hrs
Reserve Capacity
100 min
Cold Cranking Amps
650 CCA
Best Reserve Capacity in its Class
DieHard 50748 Group 48 lead_acid_battery
DieHard 50748 Group 48 lead_acid_battery
Amp Hours
70 hrs
Reserve Capacity
120 min
Cold Cranking Amps
760 CCA
Best Amp Hours and Reserve Capacity
DieHard 38217 Group 49 lead_acid_battery
DieHard 38217 Group 49 lead_acid_battery
Amp Hours
92 hrs
Reserve Capacity
170 min
Cold Cranking Amps
850 CCA

Diane Dee

Diane is a lover of all things travel. She and her young family wanted to explore North America from the comfort of their own home so they bought an RV. After fully rehabbing a 1994 Safari Trek, they set out to explore both Canada and the USA.

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