Planning to buy a group 24 battery to power your automotive, RV, or boat, but don’t know where to start? Worry no more. You’re in the right place!
In this post, we review some of the 5 best group 24 battery units found in the market today. I’ve also included a handy buyer’s guide to help you choose the right battery that’ll perfectly suit your needs.
Best Group 24 Battery – Top 5
BCI Group 24 batteries can be used in many applications, from powering medical equipment to juicing up your RV. Here are some of the best group 24 batteries you should check out!
Mighty Max’s group 24 model, the ML75-12, has everything you’d ever need in a deep cycle battery: reliability, long life cycle, and impressively high performance.
This sealed lead-acid (SLA) battery is made with no free electrolyte, meaning it won’t spill even when turned upside down. This prevents airframe corrosion damage caused by overspray or spillage, a problem that many other batteries, particularly the flooded kind, experience.
The electrolytes in this battery are equally spread over the charged plate surfaces. Due to this, you can install it in multiple positions without having to worry about how it’s positioned.
Furthermore, it’s virtually maintenance-free. Water replenishment is never required because the ML75-12 combines oxygen and hydrogen gases inside its casing instead of releasing it into the atmosphere. This saves you the hassle of having to monitor the battery’s electrolyte count.
Another great thing about this battery is its high discharge rate and low resistance. It has a power of 12v and 75Ah, which is enough to power most equipment, including safety systems, medical and communication equipment, power tools, and much more. It’s perfect for those who own trailers, boats, and electric outboards.
- Has a non-spill design, making it maintenance-free
- High shock and vibration resistance
- 1-year warranty
- Quite heavy
What makes the GPL-24T truly stand out is that it has a 550CCA (Cold Cranking Ampere) rating. That means it can deliver 500A at 0°F for 30 seconds without dropping below 7.2 volts. This is useful for those who are living in areas with extremely cold climates.
On top of that, it has the highest amp hour capacity on this list at 80AH. This makes this battery the preferred choice for RVs and marine applications, as they’re specifically manufactured to be used heavily for deep-cycle purposes.
Another great thing about it is that it’s Coast Guard approved. This comes as no surprise as many Lifeline batteries are used on US military vessels. It’s also because of this reason that it’s so durable, arguably more than the other batteries on this list.
Its self-discharge rate is 2% per month at 77°F, which is pretty good considering other batteries of this kind discharge up to 5 to 10% per month. Plus, because it features an Absorbent Glass Mat (AGM) technology, you won’t have to worry about sulfuric acid leaks or replacing lost electrolytes due to gassing. It can also easily resist shock and intense vibrations.
- Operates in extreme altitudes
- Has a rapid recharge rate and low self-discharge
- Long lifespan that ranges from 5 to 8 years under routine use.
- High amp value
- Not the most affordable
- Heavier than regular batteries
The UPG UB12750 is one of Universal Battery’s most popular products in its class. Designed primarily for off-the-grid applications, this group 24 battery is the ideal choice if you’re looking for a relatively powerful trolling motor battery.
Similar to the ML75-12, the UB12750 is an SLA/AGM battery, which means it’s spill-proof, maintenance-free, and has a high resistance to vibrations and mechanical impacts.
It also features a low-self discharge rate, wherein it remains at 91% charge when stored unused for three months and 82% after six months. That’s pretty impressive, considering boxes of the same kind deplete up to 30 to 40% of its charge after just two or three months.
When it comes to application, this battery is used for both standby and cycle use. If used in standby applications like security systems, UPS battery, and the like, it’s designed to fully power your equipment anywhere between three to five years. As a cycle application battery, it can withstand up to 1,000 charging/discharging cycles.
Universal Power doesn’t disappoint with the UB12750’s protection, as well. Because it’s an AGM battery, the electrolytes are suspended between fiberglass mats. This, in turn, protects you and the product from harm and increases its longevity.
Although the UB12750 isn’t a dual-purpose battery, some users say it has enough power to crank smaller internal combustion engines that require up to 300 amps.
- Relatively lightweight, which adds to its portability
- Can be used in both float and cycle applications
- Has a long operating life
- Extremely low-self discharge rate
- Takes a while to charge fully when completely discharged
Well under the $100 price point, the DCM0035 perfectly balances cost and performance. Although it isn’t as powerful as the ML75-12 or the UB12750, at 35Ah, you get the performance you pay for, plus more.
This deep cycle battery makes use of an AGM and VRLA (Valve Regulated Lead Acid) technology, which guarantees no maintenance nor spillage. Furthermore, it doesn’t require you to periodically refill the valve because it’s sealed, thus effectively containing the electrolytes inside. You also won’t have to worry about overpressure because it has minimal gassing.
The DCM0035 AGM battery is specifically developed for scooters and wheelchairs, contributing to its compact footprint and lightweight design.
Other than the two applications mentioned, this AGM battery can also power other equipment, such as leisure lifts, mowers, and appliances of the same power. Plus, it’s small enough to fit under the bench seat of most boats comfortably.
Another great feature is the battery’s carry handle, which allows you to easily reposition and install it anywhere. It has a thick plastic exterior to keep the battery protected, so you won’t have to worry about the occasional bump here and there. This feature guarantees its safety, as well.
- Comes with an instruction set
- Easily resists vibrations and hits
- Can be mounted almost anywhere due to its small size
- Leak-proof design
- Doesn’t have a high amp capacity
5. EverStart Maxx Lead Acid Automotive Battery – Best Cranking Group 24 Car Battery
The EverStart Maxx Automotive Battery is another lead-acid group 24 car battery that’s becoming increasingly popular among consumers. The name “EverStart” itself has been a household favorite for years, which is why it isn’t a surprise that it’s considered to be one of the best.
Compared to the Lifeline Marine AGM Battery, the EverStart Maxx has a CCA of 700, one of the highest known cold-cranking amp capacity just after 800. This battery will allow you to start your car regardless of how harsh the weather temperatures are. In fact, manufacturers claim that the EverStart Maxx is specifically designed to work in severe and rigid conditions.
If that’s not enough, the company offers a three-year warranty—the highest on this list.
The only downside to this battery is they are only used as cracking car batteries. This means you can only use it to power your car or boat, and nothing else.
- High CCA rating
- Comes with a 3-year replacement warranty in the unlikely event that it gets damaged or fails to start
- Has a relatively long life span as reported by previous users
- Can only be used as a cranking battery
What Are BCI Group 24 Batteries?
Group 24 batteries are typically used as vehicle or industrial batteries, alongside solar, trolling motor, and even sump pump backup batteries. The number “24” refers to the Battery Council International ( BCI group ) number of the battery itself.
A battery’s group size is determined by its physical dimensions, i.e., length, width, and height. This isn’t to say, however, that the bigger the battery, and higher the group. For instance, if you compare a group 51 battery and a group 24 battery, you’ll notice that group 24’s size is ever-so-slightly larger than the group 51 battery, at 9.37” x 5.06” x 8.81” (L x W x H).
In comparison, most group 24 batteries measure around 10.25″ x 6.81″ x 8.88″. They’re typically made out of Absorbent Glass Mat (AGM) and Sealed Lead Acid batteries (SLA) , but it isn’t uncommon to find them in lithium-ion batteries, gel-cell batteries, and flooded batteries.
Although group 24 batteries are generally used in deep-cycle float or standby applications, they can also be used as starting or dual-purpose batteries.
Features and Factors to Consider When Buying a Group 24 Battery
The build, design, and reliability of group 24 batteries make it a must-have addition to any home. This is especially true if you’re fond of going off the grid or boating. Regardless, not all group 24 batteries are made alike.
Here are some factors you consider before getting yourself a new battery!
Here’s the thing: all batteries, big or small, have the same basic structure—grids and separators with cell connectors that are protected in a durable polyethylene case. However, the battery’s performance all lies in its internal chemicals.
As I’ve mentioned earlier, group 24 batteries come in different chemical compositions. Some are flooded, while others are AGM or SLA. Here’s what you need to know:
These batteries, which are also commonly referred to as wet batteries, use a reservoir of liquid sulfuric acid and water to act as pathways between lead plates. Its vented wet cells allow excess gas to be expelled into the atmosphere.
As flooded batteries aren’t sealed, they handle overcharging much better. However, because they require constant refilling of distilled water, many prefer to stay away from them as they need regular maintenance. They’re the least expensive type of battery on this list.
Sealed Lead Acid
Seal lead-acid (SLA), also referred to as valve-regulated lead-acid (VRLA) batteries, is a type of lead-acid battery with a minimum amount of electrolyte. Unlike flooded batteries, they’re leak-proof, maintenance-free, and can be positioned however you like.
Furthermore, due to its self-discharge feature, they have charge retention that’s up to three times as much as regular batteries.
Absorbed Glass Mat
An AGM battery use porous glass mat separators. It’s often deemed to be the best type of battery because of its charge acceptance and excellent starting power. They also have better shock and vibration protection than wet or gel batteries and don’t require maintenance.
To reiterate, if you’re searching for an all-around convenient battery that has a quick charging capacity, AGM batteries are your best choice. You might even find AGM/SLA batteries like the Universal Power Group UB12750. If you don’t mind refilling the battery reservoir in exchange for a lesser price, you may want to consider flooded batteries.
Depending on how you wish to use your battery, you may want to choose between starting, deep cycle, or dual-purpose batteries.
Starting batteries are used to send bursts of power to an engine when the ignition switch is activated, allowing it to start and get out on the water easily.
On the other hand, deep cycle AGM batteries, AKA trolling batteries, are designed to provide a steady power current over a long period and run electronics in almost any condition.
If you’re thinking of buying both but don’t have enough space in your vehicle or boat, dual-purpose batteries are your solution. This type of battery falls in between deep-cycle and cranking. While it might seem to be the “best” option overall, it’s important to note that it’s not as powerful as either of the two batteries. Plus, it may need to be replaced more often.
Ampere Hour Rating (Ah)
In a nutshell, the amp hour rating of a battery refers to the amount of current it can supply for exactly one hour. The higher the amp hour, the longer the runtime.
Closely consider what you’re going to use your battery for. If you’re planning to use it for small applications, 35Ah might be sufficient. However, if you’re planning to take your battery on a camping trip or to power your RV, you might need something more than 50Ah.
Manufacturers generally measure the battery’s longevity by the number of cycles instead of years. It all comes down to how many times you use it.
So, when a battery has a lifespan of 1,000 cycles, it means that it can undergo up to 1,000 times the discharge and recharge process before it needs to be replaced. Therefore, the higher the cycle, the better.
A battery’s warranty period is something you shouldn’t ignore. Most group 24 batteries, such as the Deep-cycle battery, tend to last five to eight years before replacing it.
All the batteries on this list have a minimum warranty period of one year, but some manufacturers offer a 10-year long warranty for bigger and more expensive models. It’s certainly convenient to have a back-up plan just in case something happens to the battery.
How to Take Care of Group 24 Batteries
Group 24 batteries, particularly deep cycle AGM batteries, typically have a life expectancy of five to eight years. Some batteries even last over ten. This is primarily due to its maintenance-free construction and still-proof design.
Regardless, without proper care, the battery might deteriorate much faster than it’s expected to. To help you get the best out of your batteries, follow some of these tips about charging and general maintenance.
Store it Correctly
This might not come as a surprise, as even the hardiest products get damaged if they’re not stored properly. The best way to store your battery is to keep it in a cool, dry place with a decent amount of ventilation.
Every three months, don’t forget to recharge it as most batteries self-discharge. If you leave it in a discharged state, it’ll cause sulfation. Heavily sulfated batteries won’t function properly.
Don’t Overcharge or Undercharge
Overcharge your battery, and it might damage its internal structure. Undercharge it, and it might shorten its lifespan. You need to find a balance in between to increase your battery’s lifespan.
Find the correct voltage for your battery in the manufacturer’s instructions and follow it closely. As much as possible, try to avoid charging your battery with a traditional petrol generator. Instead, use the recommended charger as per the manufacturer’s instructions.
How long will a group 24 battery last?
That entirely depends on how you use your battery. Typically, group 24 starting batteries last anywhere between 3 to 12 months. AGM batteries last 4 to 8 years. Flooded and gel deep cycle batteries can last up to 5 years.
How do I find the battery group size?
The battery group size is normally printed on the label of your battery or the owner’s manual. If it isn’t readily available, you can manually measure the battery and compare it to a battery group size chart online.
What happens if I use the wrong starting group battery size on my vehicle?
Undersized batteries may not have enough power to properly start or operate your car. In worse case scenarios, using the wrong group size on your car could damage its fuse panel or computer onboard due to incorrect power spikes and surges.