Frequently Asked Questions

An Absorbed Glass Mat (AGM) battery is a high-performance, sealed lead-acid battery perfect for demanding applications. Unlike traditional batteries that require regular watering, our AGM batteries use a special fiberglass mat to absorb the electrolyte. This creates a spill-proof, leak-proof, and maintenance-free design that you can mount in virtually any position.

VMAX AGM batteries are a class above the rest. We build them with military-grade alloys and plates for extreme durability and a longer lifespan. They are engineered for deep-cycle excellence, meaning they can be drained and recharged repeatedly without losing power. If you need a battery that’s built tough for the harshest conditions, VMAX is the clear choice.

That depends on your priorities. Both are a significant upgrade over standard lead-acid batteries. Here’s a simple guide:

Choose VMAX AGM if:

You need maximum toughness: AGM is the most rugged battery technology available, offering unmatched resistance to shock and vibration.

You operate in extreme temperatures: AGMs can handle a wider temperature range compared to many Lithium batteries.

You want proven, military-grade reliability: Our AGM batteries are built like a tank and are considered one of the safest battery technologies available.

Choose VMAX Lithium (LiFePO4) if:

You need the lightest weight possible: Lithium batteries offer incredible power at a fraction of the weight of AGM batteries.

You want the longest possible lifespan: Our Lithium batteries provide up to 4,000 life cycles, offering exceptional long-term value.

You demand the best internal components: VMAX Lithium batteries use only top-tier, brand-new cells (never refurbished), a rugged Battery Management System (BMS), and built-in safety features like temperature cutoffs and cell balancing.

That weight is a sign of quality. VMAX AGM batteries are heavy because we pack them with thick, military-grade plates made from 100% virgin lead. More lead means more power, a longer life, and the rugged durability to withstand intense vibration and shock. While our Lithium line offers a fantastic lightweight solution, when it comes to AGM technology, heavy is good. It’s proof that you’re getting the toughest battery for your tough application.

VMAX is a proud American company with a team of battery experts based in Michigan, USA. We operate facilities in the US, Vietnam, China, Taiwan, and Germany to ensure the highest quality standards, with the majority of our products manufactured in our main US and Vietnam facilities.

The right battery depends on your space, desired run time, and charging system. We make it easy to find your perfect fit:

Match the Group Number: If you're replacing existing batteries, simply match their Group Number (e.g., Group 31) to the corresponding VMAX battery on our website.

Let Us Help: If you're unsure, our Michigan-based battery experts are here to help. Contact us via email or phone, and we'll guide you to the perfect battery for your needs. We offer lifetime technical support for all our products.

VMAX batteries are maintenance-free in the sense that you never have to add water or worry about acid spills like with old wet cell batteries. However, like any premium equipment, basic care ensures the best performance and longest life. We recommend periodically checking that all terminal connections are clean and tight.

Using the right charger is one of the most important factors for maximizing battery life.

For AGM 12V Batteries: You need a multi-stage smart charger that has a specific AGM setting. A compatible charger will have a bulk/absorb charging voltage between 14.4V-14.9V and a float voltage between 13.2V-13.8V.

For Lithium Batteries: You need a charger specifically designed for LiFePO4 batteries, with a charging output of 14.4V for 12V LiFePO4 batteries.

Each battery’s product page lists a recommended charging amperage. If your current charger or converter meets these specifications, you can use it.

The lifespan of a battery is measured in cycles. With proper care and charging, VMAX batteries provide exceptional longevity.

VMAX AGM: Designed for an 8-10 year lifespan in float service (like a backup system). In active use, an AGM battery discharged to 50% every other day can last 5-6 years. Daily deep discharges of 90-100% will significantly shorten the life to around 1 year.

VMAX Lithium: Our LiFePO4 batteries are rated for an incredible 4,000 life cycles, offering one of the longest service lives on the market.

Shipping is FREE to any home or business within the 48 contiguous United States. We ship orders fast—most orders placed before 2 PM EST ship the same day. 98% of our customers receive their batteries within 2-5 business days. Heavy orders that ship via LTL Freight will ship the next business day. We use top-tier carriers for LTL shipments to ensure a safe and quick delivery.

Click here for our to view our shipping policy

We aim for a simple, hassle-free process.

If we made a mistake (damaged in transit, wrong item), we will exchange it immediately at no cost to you.

If you changed your mind or ordered the wrong item, you can return it within 30 days. We offer a discounted return shipping program to make it as easy and affordable as possible. Just email us with your order number to get started.

We stand behind our products with a clear, straightforward warranty.

AGM Batteries & Chargers: 1-Year Full Replacement Warranty.

LiFePO4 Lithium Batteries: 7-Year Pro-Rated Warranty.

You can view the full warranty details on our Warranty page.

Our goal is to be fair and efficient. If you believe your battery is defective within the warranty guidelines, our Michigan-based support staff will first help you troubleshoot the issue. Often, the problem can be resolved with a simple adjustment. If a warranty exchange is needed, we will guide you through every step and offer discounted return shipping options to make it easy. VMAX provides lifetime technical support.

While other AGM batteries may look similar on the outside, the real difference is inside. VMAX AGM batteries are overbuilt from the ground up to deliver superior performance, a longer lifespan, and unmatched reliability in the most demanding conditions.

Here’s what sets a VMAX AGM battery apart:

Extreme Durability and Toughness: The heart of every VMAX battery is the unique physical and chemical structure of its heavy-duty, plates. A special manufacturing process gives them strength and performance that far exceeds competitors. We pack these plates tightly with a specially designed Absorbed Glass Matt (AGM) that maximizes the battery's resistance to shock and vibration. The entire package is protected by an extra-strong ABS container that reduces bulging and warping, ensuring high performance for years to come.

Reliability When It Matters Most: VMAX batteries are known for their ability to recover after repeated deep discharges. Our heavy-duty grids provide an extra margin of performance even after being over-discharged. This means you get one of the highest numbers of discharge/recharge cycles in the industry, making VMAX the favorite choice for any application where failure is not an option.

Truly Maintenance-Free & Safe: Our sealed, leak-proof construction guarantees operation in any position. Because the electrolyte is fully absorbed, there is no need to ever add water or check specific gravity. The design controls and recombines over 99% of gases, and a built-in safety valve prevents any excessive pressure, making it incredibly safe. VMAX batteries are classified as non-spillable and non-hazardous, meaning they are not restricted for air, sea, or surface transport.

Longer Life & Better Value: VMAX AGM batteries have an expected float service life of 8 to 10 years. They also hold their charge much longer when not in use, with a self-discharge rate of just 1-2% per month compared to 15-20% for many standard lead-acid batteries. This means your battery is ready to go when you are, even after sitting in storage.

Anyone is welcome to order. If you are a dealer or distributor, please click here to apply for a dealer account.