Top 5 Best Group 27 Batteries (Detailed Review)

Group 27 batteries are powerful and top-notch performing deep cycle batteries. The cold-cranking amps usually range from 600 to 1000 and reserve capacities between 140 and 220 minutes.

The group 27 batteries have tremendous power storage capabilities that allow them to store electrical power for later release and use over a long period of time. This also describes why they are commonly used in wind and solar power generation systems that require backup power as well as RVs, marine engines, and other automotive applications that require huge start-up power.

Best Group 27 Batteries (2021 Review): Our Top 5 Picks

With so many options around, battery reviews can be a helpful way of determining your best options. Read our review of the 5 Group 27 Batteries and choose your best pick.

Product List Buy From
Optima Batteries 8027-127 D27M BLUETOP Starting and Deep Cycle Marine Battery
VMAX MR127 12 Volt 100Ah AGM Deep Cycle Maintenance Free Battery
12V 100Ah AGM Sealed Lead Acid Battery UB121000 Group 27
Marine Battery Replaces D27M 8027-127 Group 27
POWERSTAR Group 27 12V 100Ah Sealed Lead Acid Rechargeable Deep Cycle Battery

Optima Batteries 8027-127 D27M BLUETOP Starting and Deep Cycle Marine BatteryGroup 27 Battery

Product Features:

  • AGM design
  • Weight: 25 pounds
  • Dimensions: 12.2 x 6.8 x 8.7 inches
  • Capacity: 66 Ah
  • Voltage: 12 volts
  • Reserve Capacity at 25 Amps: 140 Minutes

Performance of the Battery:

This battery performs well. When we consider the price, it offers much more than its price range allows. Pure lead plates are used in this optima blue top d27m battery, which means maximum power and conductance. It is possible to extend the life of the battery by using deep-cycle abilities. Through spiral cell technology, the battery continuously consumes all of the current contained in the acid. Although the performance of the battery is quite good, it cannot be compared with high-end batteries, which have a superior build and technology.

Charge of the Battery:

The battery can be charged in one full night, for the D27M optima battery you can expect a great deal of performance. It can deliver more power than conventional batteries, so the charge from the battery lasts longer.

The Battery’s durability:

It has a longer lifespan compared to traditional batteries because of a solid body and fifteen-fold better resistance to vibrations. Comparatively, this battery is capable of handling tough situations well. No second thought needs to be given to whether this will fit on your board.

Our Review:

Optima Batteries D27M BlueTop Group 27 Marine Battery provides enough deep cycle power to run stereos, GPS systems, bilge pumps, fish finders, and other high-demand electronics, and will still provide plenty of cranking power to start the motor.

The D27M BlueTop could also be a great choice in extremely cold weather as it covers a cold-cranking amp of 800A plus the marine cranking amps is 1000A.

The Group 27 battery has longer life, more resistant to vibration, is completely spill-proof and mountable in almost any position with faster recharging capabilities.

OPTIMA BlueTop is a high-performance AGM battery for your boat or RV. It provides exceptional running time and recharges three times than you’d get out of a traditional battery. The BlueTop efficient power delivery and faster recharge time mean you’ll spend less time worrying about your battery. So more time for fun.

The cells in an Optima battery are tightly compressed into supportive chambers and secured with solid cast cell connections resulting in 15 times more vibration resistance than traditional batteries. Tightly sealed cells allow for mounting in multiple positions without leaking or damaging your vehicle and glass-mat separators absorb electrolyte to eliminate acid spilling.

The D27M BlueTop is a reliable marine battery for your boat with trolling motors, extensive electronic systems, and works well as an RV battery too.

Useful Information:

  • There is a lot of weight in this battery.
  • Consequently, the battery must be recharged using an AGM battery charging unit.
  • Recharge the battery immediately after use.
  • A battery can cost a lot of money, especially if you use it a lot, since it is a battery and it will be used frequently, so its lifespan will be shorter than a DieHard, Delco, or marine-grade battery.
  • After use, the battery’s life is reduced incrementally by discharging and recharging.
  • Spill-proof battery
  • Can be used as boat battery or RV battery
  • Spring cell technology
  • Maintenance-free
  • More than 15 times the vibration resistance
  • Fast-recharging
  • Pricey

VMAX MR127 12 Volt 100Ah AGM Deep Cycle Maintenance Free Battery Group 27 Battery

Product Features:

  • AGM design
  • Weight: 68 pounds
  • Capacity: 100 Ah
  • Voltage: 12 volts

Technology AGM:

As the plates are made of absorbed glass, the electrolyte can flow freely inside. This prevents poisoning and ensures that the battery is non-spillable.

Battery with a deep cycle:

These Marine Master VMAX batteries are perfect for use during deep cycle periods and can be used continuously for two or three hours.

Fast charging:

In addition to their additional strength, these grids also extend the shelf life of batteries. VMAX heavy duty lead tin alloys provide a longer service life and enhanced performance even after repeated over discharges in either float or cyclic applications. After continuous usage for a very long period of time, it can be recharged very quickly.

Our Review:

The Vmax MR127 MA is also a group 27 deep cycle battery especially designed for heavy-duty trolling motors. With 100Ah rating, the VMAX gives you maximum power for smooth functioning of machines.

The battery doesn’t take up a massive amount of space on your ship, thanks to the body dimensions of the battery and its compactness. Not to forget though, the battery is quite heavy, so you might need some help carrying it onto your boat and positioning it perfectly.

Though VMAX Tanks are best known for their long life span, their capability to recover after repeated deep discharges is what makes them the favorite choice for any application.

Since the electrolyte is totally absorbed by the AGM, the VMAX is classified as “non-spillable and non-hazardous”. A tough Tank seals and protects the tightly packed plates used in the VMAX, making it a 100% maintenance-free battery.

Furthermore, the MR127 MA can hold charge brilliantly. Being a deep cycle battery, the battery can be charged and used several times without any impact on its performance. The most important thing is that the MR127 MA works very well and gives 100-amp hours, proving they’re suitable for large boats as they run them without difficulty for hours.

MR127 MA was manufactured using the Absorbent Glass Mat (AGM) technology to help keep costs down while also ensuring optimum delivery.

The Group 27 battery can discharge twice as fast as traditional batteries, delivering excellent performance. To attain the full capacity of the VMAX it is important to check the charger regularly and charge the battery full. The battery though takes less time to recharge as compared to the competing products in the market.

Useful Information:

  • Structure and chemical composition are unique.
  • A high level of performance and reliability.
  • It can fit into any battery box in the Group 27 series.
  • There is no maintenance required for the battery.
  • Utilizes an AGM that is specially designed.
  • Fast charging
  • Vibration resistant
  • Great build quality
  • Longer life span
  • Heavy

12V 100Ah AGM Sealed Lead Acid Battery UB121000 Group 27Group 27 Battery

Product Features:

  • AGM design
  • Weight: 63.93 pounds
  • Dimensions: 12.17 inches x 6.61 inches x 9.16 inches
  • Capacity: 100 Ah
  • Voltage: 12 volts
  • 1 Year Warranty

Product Versatility:

In terms of versatility, it is truly outstanding, as it can be mounted anywhere. Despite that, installing and mounting this battery is as easy as an ordinary battery. It is really the versatility of this product that makes it so unique. Despite its durability, the battery is extremely reliable. Furthermore, it can withstand vibrations and shocks. Furthermore, it provides excellent impact resistance and can operate in cold, as well as hot, temperatures.

Battery’s dependability:

Its compact design provides reliable power for a variety of essential applications. As a result, it is highly durable and strong, as well as resistant to heat, chemical agents, shock, and vibration.

Provide free maintenance:

The battery is also maintenance-free, and the spill-proof design ensures it won’t leak. The battery is not particularly compact or lightweight.

Our Review:

The UB121000 is designed to handle a variety of deep-cycle needs. It can be used for a variety of purposes including golf carts, solar panels, campervan and for trolling motor vehicles. For equipment that requires a slow, steady draw of energy, the group 27 battery is your go-to product then.

The UB121000 is 63.93 pounds and is quite heavy but its small size makes it an easy-to-carry option for you. Moreover the battery can be mounted in any position.

Another noteworthy feature of this battery is that it charges really fast, and holds the charge for a long time as well. It has a standing self-discharge of less than 3%, so you won’t be bothered much to charge it regularly.

Unlike the traditional lead-acid batteries that freely flood their electrodes, AGM batteries have glass mats that prevent this. Additionally, it is the function of these glass mats to avoid spillage. Rather than absorbing the electrolyte, the glass mats work by holding the electrolyte in place, preventing it from spilling over, even when the battery is placed in odd positions.

Moreover, they are invulnerable to the subsequent wear and tear that may result from frequent and continuous vibrations. Furthermore, they can withstand extreme temperature variations.

As a whole, the UB121000 is a top-rated high-quality deep cycle group 27 battery which can be relied upon for outstanding results. Not to forget, it comes with a 1 year warranty. The price is on the higher side but worth your money.

Useful Information :

  • This charger is specifically designed to handle deep cycling with a 100Ah capacity. Batteries like these do not operate as starters, and they should not be used to start motors or mechanical devices.
  • There is no maintenance required for this battery.
  • AGM technology is used to manufacture and design it, which enables the battery to charge quickly and perform well.
  • Battery discharges at a rate of less than 3% each month, making it a highly efficient means of storing energy.
  • Works for long hours
  • Resists shocks and vibration
  • Maintenance free, spill proof battery
  • Rechargeable, can be mounted in any position
  • Not easy to mount in small compartments

Marine Battery Replaces D27M 8027-127 Group 27Group 27 Battery

Product Features:

  • AGM design
  • Weight: 37 pounds
  • Dimensions: 12.2 x 6.8 x 8.9 inches
  • Cold Cranking Amps: 800
  • Capacity: 77 Ah
  • Voltage: 12 volts
  • 2 Year Warranty
  • Reserve Capacity at 25 Amps: 114 Minutes

Long-term capabilities:

Batteries from Banshee are designed to handle deep charges as well as slow, long recharges. Optima D27M’s battery is replaced by the Banshee marine deep-cycle battery and provides long-lasting performance with excellent rechargeability.

Additional battery plates:

There are more battery plates on Banshee Marine Batteries, which is an advantage. In addition to having more battery plates, there is also more surface area on the plates. Banshee batteries therefore have twice as much power as conventional batteries. Battery Banshees can crank engines as well as any other battery in the same size, no matter what the temperature is.

Improved technology:

Batteries containing improved flooded technology, known as EFB technology, cannot be placed on their side or upside down. Batteries with EFB technology are a more advanced version of wet-flooded batteries. If equipment operates in a reduced state of charge, EFB technology has the benefit of improved charge acceptance and greater cyclic durability.

Our Review:

The Banshee marine deep-cycle battery is a direct replacement for Optima D27M batteries and has excellent recharge capabilities for long lasting performance.

The D27M 8027-127 Group 27 battery has more battery plates and hence more plate surface area. That means that the Banshee battery provides more power – in-fact twice than the conventional batteries on offer.

Marine group 27 batteries have a built-in Hydrometer. The very feature enables you to check the current state of your battery life. Furthermore you can use the battery for both starting and deep cycle, which means it can get your RV on the road as well as it can supply power to the cabin.

The battery is capable of providing engine cranking as good as any other battery equally sized, even at very low temperatures.

It guarantees amazing recharge capabilities as well as reliable energy storage. Body-wise, the battery comes with dual terminals and a build quality that enables it to withstand rigorous deep charges as well as long slow recharges.

The battery cannot be installed on its side or upside down. Nonetheless, you get improved charge acceptance and greater cyclic durability.

Useful Information:

  • Batteries of the Banshee line are built to withstand slow long-term charging and rigorous deep charging. There are Dual terminals on this battery from Group 27M.
  • Threads and studs are configured for the terminals.
  • In comparison with conventional batteries, Banshee batteries offer twice the power.
  • It features a handle that makes carrying and transportation easier.
  • The product is suitable for both indoor and outdoor environments. This battery is ideal for water enthusiasts who manage a boat or small equipment inside and outside the house.
  • Amazingly lightweight
  • Twice the power of conventional batteries
  • Affordable price
  • Not a leak-proof battery
  • Cannot be installed from any angle

Read Our Guide On : Best Deep Cycle Battery For Trolling Motor (Detailed Review)

POWERSTAR Group 27 12V 100Ah Sealed Lead Acid Rechargeable Deep Cycle BatteryGroup 27 Battery

Product Features:

  • AGM design
  • Vehicle service type: RV, Wheelchair, Mobility Scooter
  • Dimensions: 13 x 6.6 x 8.62 inches
  • Capacity: 100 Ah
  • Voltage: 12 volts
  • 2 Year Warranty

Durable batteries:

Batteries of this type are built to last for several years, provide efficient power and do not need to be maintained.

The glass mat technology:

Glass mat technology is used in the design of this battery. A fine glass fiber separator in this device absorbs electrolytes for a longer life. It has a design that prevents leaks, which also allows the user to place this battery in any position.

Attained high reliability:

Battery Power-Stars are made to provide reliable, long-lasting performance in any position. SLA batteries by Power-Star provide stable, reliable performance. Maintaining it is easy, which makes it possible for the equipment it powers to function properly.

Our Review:

The PowerStar group 27 battery is 100% Compatible OEM replacement for Solar, UPS, Alarm System, RV, Wheelchair, and More.

The unique construction and sealing of the battery ensure that no electrolyte leakage can occur from the terminals or case. This feature ensures safe, efficient operation of PowerStar batteries in any position. PowerStar batteries are classified as “Non-Spillable”.

The group 27 battery makes use of fine mat separators (glass fiber) wherein sufficient electrolyte is absorbed to provide the longest life and steady service.

During the expected floating service life of PowerStar batteries, there is no need to check the specific gravity of the electrolyte or add water, which means they require no maintenance service. In fact, there is no provision for these maintenance functions.

The combination of the sealed construction and the use of absorptive mat separators permit operation of PowerStar batteries in any position without loss of capacity, electrolytes, or service life. The battery is made to operate in any position.

The PowerStar SLA battery can be easily maintained to permit proper operation of the equipment that it powers. The battery can withstand overcharge, over discharge, vibration, shock, and is capable of extended storage. The PowerStar SLA battery has a long life in float or cyclic service.

Useful Information:

  • POWERSTAR batteries feature a unique sealed construction, which assures no electrolyte leaks from the case or terminals.
  • AGM system POWERSTAR batteries utilize a mat separator (glass fiber) that is sufficiently absorbed to give them the longest lifespan and steady performance.
  • POWERSTAR batteries have a recombination feature that allows most of the gas generated during normal use to be recombined into fuel.
  • Batteries from POWERSTAR can be used at any angle.
  • POWERSTAR SLA batteries are reliable and stable.
  • Maintenance Free Battery
  • Spill Proof (Sealed Lead-Acid) Battery
  • Position-Free & Leakage-Free Design
  • Low Pressure Venting System
  • High Recovery Capability
  • A little too large

Group 27 Battery Buying Guide:

It is important that you know the features of group 27 batteries before making an informed decision. By doing so, you will be able to make the right choice based on the usage you have.

Batteries Types:

Generally, there are two types of lead acid batteries and three subcategories within those types. There are two primary types of starting crank, as well as deep cycle marine and golf cart. In comparison to standard V-belt start lights, starting battery SLI lights are designed to provide quick bursts of energy to start engines. The most common applications for Group 27 batteries are for vehicles, marine, private grids, recreational vehicles and others.

Below Are The Two Most Common Types Of Group 27 Batteries:

The Lead Acid:

Batteries made of lead acid are more affordable than those made of lithium. These require more maintenance than AGMs. The lifespan of a lead acid battery is about two and a half to three years. When trolling, they are perfectly capable of recharging and draining. The downside of Lead Acid batteries is that they will require more effort to maintain, as distilled water is needed to maintain them.


The batteries with AGM technology are completely sealed and made of Absorbed Glass Mat material. They are more durable than standard batteries in a way, because they do not require maintenance. On top of that, these batteries can be recharged many times. Four years is the maximum life expectancy of an AGM battery.

Battery capacity of Group 27:

The first thing you should consider when buying a deep-cycle battery is its capacity. The capacity is measured in Ah (Amp Hour). The Amp hour rating of a battery determines how much current it can safely supply for a certain time period.

Since 100Ah is the standard capacity for most batteries, you will often find them on the market. It might be necessary to buy a higher capacity if you plan to use heavy-duty equipment. In general, higher capacities are associated with higher prices. This is why it is important to take the time to evaluate your needs before buying.

Charge cycle of a Battery:

Battery life is determined by the number of times in which they can be recharged and discharged. In order to keep your battery running for a long time, opt for a model with more discharge and charge cycles.

The Cost of Group 27 battery:

Cost and price are not the same thing. Poor-quality batteries require frequent replacement, which can be expensive on its own. The lifespan of such devices will also be shorter than those made from high-quality materials. There will also be maintenance costs that you’ll have to pay more than often.

People might ask:

Is it possible to recharge a dead Optima battery?

A modern charger that has kept up with battery technology is the best way to recharge a deeply discharged AGM battery. AGM batteries can be reconditioned and recovered by using chargers that have special settings and desulfation steps for AGM batteries. Optima batteries can be charged with any charger as long as the voltage is regulated.

What is the life expectancy of an Optima marine battery?

It is possible to expect the battery life of an OPTIMA unit to last up to four years. On the other hand, in a less humid climate, like San Diego, an OPTIMA battery can last up to eight years instead of four. Further battery performance and lifespan are also affected by how they are used.

Is The Optima Battery Worth It?

Yes, Optima Batteries can be the best choice for a new car or vehicle that you plan to use for years to come. Due to the fact AGM batteries come in three varieties, it is best to choose the one that meets its needs. In addition to its Spiral cell technology, Optima’s Pure flow technology allows Optima batteries to withstand vibrations 15 times stronger than competitive batteries.

How good are Vmax batteries?

Battery manufacturer VMAX produces deep cycle battery systems known for high performance, durability, and long recharging time. Solar batteries can also be used in extreme weather conditions since they rely on solar energy.

What happens to an AGM battery when it is charged with a standard charger?

Using a regular charger, the battery has the possibility of being overcharged, according to the battery experts. An overcharged AGM battery can be permanently damaged and not repairable if it’s overcharged. Battery overcharging can also adversely affect the battery’s capacity to hold a charge.

How long does it take to charge AGM batteries?

Low temperatures don’t affect the battery’s performance, and it has a low self-discharge rate. It is up to five times faster to charge an AGM battery than a flooded battery, and it is also capable of deep cycling.

What is the life expectancy of a 12V deep cycle battery?

If they are treated properly and charged (based on how often they are used), deep cycle batteries last for an average of six years. You need to make sure your charging routine does not cause damage to your battery.

What is a group 27 battery?

Battery Group 27 is a powerful battery that offers 20h capacity in a range of 66-110 Ah, providing 600-1000 CCA, 140-220 minutes RC. One of the most popular battery types, these batteries are found in applications such as cars, boats and similar ones.

What is the difference between a deep cycle battery and a marine battery?

Deep cycle batteries have fewer, thicker plates than marine batteries, which allows them to provide continuous power output for a long time period. Battery deep cycles can be completely discharged and recharged more than once, but cranking batteries can’t.

What is the life expectancy of a group 27 battery?

First divide the amp-hour rating of the battery by half (50%). It is often around 95 amp-hours for a new group 27. Depending on how old the battery is, its rating will decrease.


The group 27 batteries are widely known for their excellent performances in a variety of applications. They are high-rated fast-recharging, spill-proof, rechargeable, maintenance-free, AGM design, deep cycle batteries providing you the full value-for-money. They are designed and equipped to meet your different needs. You can buy your best pick.

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