Vmaxtanks VMAXSLR125 AGM 12V 125Ah

Vmaxtanks VMAXSLR125 AGM 12V 125AhIf you’re looking for a battery with an amazing deep cycling capacity, this is the one for you. With a capacity of a whopping 125Ah, this is one of the best deep cycling batteries on the market. What’s more, is that the battery is extremely durable and can easily last up to 8-10 years.

The battery comes with a reserve capacity of 260 minutes of reserve capacity which is just another proof of its amazing capacity.

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The battery is found to be best for applications that require a fair amount of deep cycling capacities. It has found its niche in applications like solar batteries, inverters and RVs.

On the other side of the scale, this battery really takes a hit when it comes to price point as it is one of the more expensive batteries in the market.

But before we move on to making our final deductions, let us analyse all its features in detail.

Vmaxtanks VMAXSLR125 Features

Deep Cycling Capacity

The most marketable feature of the product is definitely its deep cycling capacity. There are different types of batteries. Deep cycling batteries are the ones that are meant to last longer than usual batteries providing a steady flow of electricity. We can discharge a deep cycling battery upto 80% and still squeeze some juice out of it, unlike most other batteries that fail completely after falling below a certain threshold. 

A deep cycling battery will keep on providing a lower current as the voltage decreases and keep doing that until the battery is almost drained.

The 125Ah rating of the VMAXSLR125 means that your battery provides a constant current of 5A at a reasonable voltage. It can do so for 25 hours without any issues. 

125Ah is really one of the greatest capacities offered by most batteries in the market and if you’re looking for something in that area, the VMAXSLR125 is a really great contender. This functionality makes it an excellent choice for applications where cranking power is not an issue, like inverters and solar cells, etc.

The battery has also found a place in the automobile industry but it must be noted that the cranking power is not really the best and thus it is only a good option if you;re looking for something like a secondary battery.

Reserve Capacity

The reserve capacity of a battery is the number of minutes a battery can offer a constant current of 25 amperes at 10.5 Volts at a temperature of 80 fahrenheit.  

The 260 minute reserve capacity is one of the best in the market, yet again. It really makes up for the mediocre cranking power by offering more time for the battery to crank the engine if you’re using the battery in an automobile as the primary battery. 

The reserve capacity is utilised before the engine starts and can charge the battery. The cranking time depends on a lot of situations and sometimes it can take much longer than usual. A good reserve capacity makes sure you do not end up with a dead battery in a critical situation trying to start the engine.

While the primary feature of the battery is still its deep cycling capacity, you can still use the battery as a cranking battery if you do not have demanding requirements for cranking power. This could give the battery a really nice “dual-purpose” functionality, which is always a good deal.

Absorbent Glass Mat technology

Absorbent Glass Mat technology is one of the most popular technologies when it comes to batteries these days. Unlike traditional batteries, AGM batteries do not require any sort of maintenance as there is no liquid inside the battery.

Unlike traditional batteries, there is no requirement to refill the battery from time to time. The battery is completely sealed and can be mounted in any position without compromising capacity. This also provides excellent vibration resistance and added durability. AGM batteries have longer battery lives than traditional acid batteries. 

The battery claims to have a battery life of 8-10 years, thanks to this technology and even comes with a substantial warranty so you can rest assured.

But again, there are also some challenges when it comes to using this battery. Let’s see what they are.

Vmaxtanks VMAXSLR125 Drawbacks


This is a Group 31 battery and consequently pretty bulky. Another reason why it’s not fit for all automobiles. You may not want to install this battery in your vehicle if it’s really small. Even though the installation is really simple, the size and weight greatly affect mobility.


The battery can be quite pricey for sometimes who’s just looking for a simple and elegant battery for minimal requirements. But again, you’re probably looking into buying this battery because you have some demanding requirements in which case it’s a good deal for the money.

The price can be seen as a good investment, however, considering the long battery life and this could be an excellent option if battery life is what you seek. 

Before coming to the final verdict, let us compare the pros and cons one last time to give us a clearer vision.


  • Excellent deep cycling. 125Ah capacity.
  • 260 minutes of reserve capacity.
  • Durable AGM technology.
  • Long battery life 
  • Easily installable design.


  • Bulky.
  • Could be expensive in some cases.

Vmaxtanks VMAXSLR125 FAQ’s

Are VMAXTANKS batteries good?

VMAXTANKS is a well known brand when it comes to batteries. Their batteries are known for their excellent deep cycling capacity and long battery life. The batteries have an AGM technology that increases durability.

What are solar batteries?

Solar batteries are batteries that can be charged using solar panels. Where traditional batteries need a power circuit and take charge from electrical sources, solar batteries can directly store the energy from the sun without any hassle.

Can I use my car battery as a solar battery?

While it is not technically impossible, car batteries are usually cranking batteries with very low deep-cycling capacity. Hence, over prolonged usage, the car battery may exhibit a reduced battery life if it is used continuously. Deep cycle batteries are an excellent choice as they are quite compatible with the setup.

Final Words

Keeping in mind both sides of the equations, it is safe to conclude that this 12v battery is an amazing product when it comes to deep-cycling. The best applications would be where the size is not a concern such as RVs, inverter batteries, solar cells, etc. 

The size and price can be a challenge but in the end, if it meets and fulfills your requirements and is not an overkill, it is definitely a good product to invest into.