Are you looking for the best Group 27 battery for your use? Or are you confused about which option to buy? I have compiled the perfect list, which dives into the details of the top-rated ones, covering all price ranges, so you don’t have to consult multiple lists.

All of these are chosen based on not only their performance but their price and the manufacturers’ after-sale service, so you don’t have to worry about researching about anything. The list starts with the best battery first and goes down in accordance with their price to performance ratio.

Top 5 Best Group 27 Battery Comparison

1. VMAX MR127 12 Volt 100Ah AGM Deep Cycle Maintenance Free Battery

There are many reasons for a VMAX MR127 Battery to land on the first spot. First of all, it has an AGM design, which makes it virtually leak-proof and extra resistant to shocks and vibrations. According to reviews, it has excellent build quality, which means it can be used in various applications without the problem of it failing on you.

VMAX is the only manufacturer that uses an electrolyte suspension system on its batteries. This suspension system’s advantage is that it is extra porous to absorb all the electrolytes for excellent performance and efficiency.

This VMAX battery is a deep cycle battery. If, on a rare occasion, you drain out the battery fully, you don’t have to worry about it failing on you, as it is designed to handle many discharges. It is manufactured using tin alloy, which extends its life and improves performance.

Also charges 40% faster than any other battery available on this list. Even if you use the given charger to charge a conventional battery and this one for comparison, it will charge 40% faster. This is useful, especially when you are running late.

VMAX also provides the buyer with a 12-month warranty in which the battery can be replaced, due to manufacturing faults, free of cost.

The MR127 has two drawbacks. It is a bit oversized than other batteries, making it a little difficult to store. It also has a high price tag.
  • Excellent performance
  • 40% faster charging than other batteries
  • Leakproof
  • Shock and vibration resistant
  • Short warranty period
  • A bit oversized
  • Expensive than other batteries

All in all, the VMAX battery has great performance and features, which is only possible with a hefty price tag. For the price, there is no battery better than this one. However, the warranty period could be improved.

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


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2. Optima Batteries 8027-127 D27M BLUETOP Starting And Deep Cycle Marine Battery

Optima Batteries is one of the most famous battery manufacturers globally, so there was no doubt that it would earn a spot on this highly narrowed down list. The Optima 8027-127M BlueTop Battery has been built from the ground up to be more shock and vibration resistant than any other battery on the market.

Optima Batteries claim that it is fifteen times more resistant than conventional batteries. So, whether you go off-roading in your RV or go for long drives in your boat, you can be tension free.

The Battery is designed to be dual purposed. This means that it can be deep cycled and can be used as a starting battery without losing performance. It provides the vehicle with excellent cranking power for reliability, starting every single time. It can handle power hungry systems easily and discharged completely many times without the risk of it failing on you.

Like the VMAX, the Optima battery has an AGM design, which means it has a higher cranking power and a much quicker recharge time than a conventional flooded battery.

Another reason for the greater efficiency and quicker recharge time is the use of 99.99% pure lead by Optima Batteries, unlike other conventional batteries that use some sort of alloy to cut costs. The use of pure lead also greatly improves its life, which is a major factor to be considered when buying a good battery.

The manufacturer is also generous enough to include a 2-year warranty in which the product is replaced free of cost if any manufacturing fault arises during its use.

The marine battery has two drawbacks. The first problem is that it is quite expensive, more than the VMAX, but it shows great performance. The other drawback is that the manufacturer has very poor after-sales service making it difficult to claim the warranty if needed.
  • Dual cycle
  • Reliable start-up
  • Maintenance-free
  • Spill-proof
  • Highly shock and vibration resistant
  • Very expensive
  • The difficult warranty claim process

Summing everything up, the Optima battery is one of the best options for getting a dual cycle battery with reliable and long-lasting performance. What dropped it down to second place is the high price tag and poor after-sales service when claiming a warranty.

Optima Batteries 8027-127 D27M BLUETOP Starting And Deep Cycle Marine Battery
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04/17/2022 12:21 am GMT
・Check the article on Best Optima BlueTop Batteries.

3. NorthStar Pure Lead Group 27 Battery

Another excellent battery from a renowned manufacturer ends up here, which hunts for the market’s highest-rated batteries. Like the first two batteries, the NorthStar Pure Lead Automotive Group 27 Battery uses an AGM design, which provides higher cranking amps and larger battery life than traditional flooded batteries.

It also uses 99.99% pure lead for a quicker charge and reliable performance throughout its usage. The use of an AGM design also means that it is maintenance-free. You don’t have to check for refilling the water or clean terminals. It is also fully sealed, so it is virtually leak proof. It has been approved as a non-hazardous battery in the United States.

The NorthStar battery can be used in temperatures from as low as -40°C and up to 45°C. Even at an exceedingly low temperature of -30°C, it provides 650 cranking amps for a reliable start-up wherever you go.

NorthStar states that this model can handle more than 900 cycles at around a 50% discharge rate. So, this makes it one of the best ones to have in terms of deep cycles. So, you don’t have to worry about it dying if you use up its entire charge. It can continuously give power to power-hungry electronics easily. It also recharges much faster than conventional batteries.

This brand is one of the two manufacturers that provides a full four-year warranty backup with its batteries, so you can buy it tension free. If any defects arise due to poor workmanship or not performing on par with what is advertised, the unit will be replaced free of cost.

The only drawback is that it is very expensive.
  • Excellent performance
  • Leakproof
  • It can be deep cycled
  • Four-year warranty
  • Maintenance-free
  • Very expensive

Although the NSB-AGM27 has a very high price tag, it comes with great performance and has one of the manufacturer’s longest warranty here. It has a reliable start-up in all weather conditions and does not even require maintenance. It can even be deep cycled up to 900 times.

NorthStar Pure Lead Group 27 Battery
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04/17/2022 12:22 am GMT
・Read my full reviews on the top NorthStar automotive batteries.

4. GreenLiFE Battery GL80-80AH 12V Lithium Ion Battery Group 27

Sliding into fourth place is a battery by GreenLife. The main reason for choosing this very different battery is its smart functionality, which greatly extends its life. It features a fully automatic Battery Protection System (BPS), which saves it from over charging and even Undervoltage.

All of this is possible only due to the use of top of the line sensors, set to detect the voltage levels. So, when charging, if it crosses 15.8V, it stops charging. This is the main differentiating factor from all batteries on the market, which have no smart functionality to monitor or even warn the user to extend its life. If, while discharging, it goes under 10.5V, the battery turns itself off to protect it from dying.

The GreenLiFE Battery GL80 has a unique design. Unlike an AGM or even a conventional flooded design, it uses a lithium-ion design to store its charge. The technology in this one is just like the one found in phone batteries. The use of lithium-ion cells means that it has little to no self-discharge.

Conventional lead-based batteries self-discharge at the rate of up to 30% per month. The GreenLife alternative drops the same percentage after ten months. This means that it has virtually no self-discharged.

Due to no acid, the GreenLife battery charges much faster than conventional ones and has little to no heat loss while charging. This greatly increases its charge time, making it much faster than other batteries on the market.

The use of lithium-ion cells also means that it can be discharged fully without damaging it. It has been built to withstand various temperatures from -20°C up to 60°C, so you don’t have to worry about where you take and use it.

The GreenLife battery is very expensive, considering it uses a very different and less tested approach to a deep cycle battery.
  • Protects from overcharge
  • Protects from under volt
  • Fast charging
  • Maintenance-free
  • 5-year warranty
  • Very expensive

Although the GreenLife battery has top of the line features that no other battery provides, it is not yet widely tested to draw such power from a lithium-ion cell. It comes with the longest warranty of any other battery on this list. The only drawback is its high price tag, a pattern on many batteries.

GreenLiFE Battery GL80-80AH 12V Lithium Ion Battery Group 27
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04/17/2022 12:19 am GMT

5. Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery 12V 24V 48V

All of the above have seen very expensive batteries, but they justify their price tag with their top of the line features and performance. Coming on the cheap side is a battery by Universal Power Group 12V. It uses an AGM design, and despite being relatively cheap, it performs efficiently and provides excellent performance.

It has the most common usage scenario in solar applications as it charges very quickly. Given the price tag, many can be bought simultaneously and set to be charged quickly and reliably. It can also be used in trolling motor vehicles such as boats.

The deep cycle battery is heavy-duty, which means it can withstand heavy loads without any problem. Due to it having an AGM design, it is sealed. It requires no maintenance as it needs no water refill or even cleaning of the terminals. Due to it being sealed, the battery is virtually leak proof.

It can be mounted in any position except inverted, which means it has very flexible installation options. Shocks are one of the main reasons for batteries failing quickly. The Universal Power Group battery has excellent vibration and shock resistance, which means it can be used with peace of mind.

The UB121000 has one of the best discharge rates of any battery. Even after sitting idle for three months, it still retained a 91% charge. After one whole year, it still retained a very impressive and respectable 64% charge.

The only drawback is its weight. It’s quite heavy which may require a second person when installing it.
  • Maintenance-free
  • Leakproof
  • Shock and vibration proof
  • Very slow self-discharge rate
  • One year warranty
  • Very heavy

All in all, the battery performs excellently in all manners. Although it has a one year warranty, you cannot complain about this price tag. It has a very impressive discharge rate and is even maintenance-free.

Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery 12V 24V 48V
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04/17/2022 12:26 am GMT


This is the end of the line for this article. I hope that after going through this list of the best Group 27 battery for your use, you may not have to consult another article again. The batteries were chosen because they were the best in their price range in accordance with their performance.

I would recommend the battery by NorthStar, given that the price is no issue because it provides all the best features and performs in a very reliable manner. The only drawback of the battery is its price, which is justified with its 4-year replacement warranty and great features.

I would also recommend the GreenLife Battery, but I cannot guarantee how it would perform due to it using a lithium-ion cell design. In the end, the decision falls upon you in choosing which battery is the perfect one for you.