AGM vs. lithium batteries: Determining the ideal power solution for your needs

Find out which type of battery might be best suited for your favourite activities.

Both AGM and lithium batteries are favoured among those seeking dependable power solutions on the go. But how do you determine which battery type is the right choice for you? Each has their own unique characteristics, but a decision will largely hinge on your specific power requirements and intended activities. Keep reading for a brief overview that can assist you in navigating the differences between these battery types.

What are AGM batteries?

AGM (Absorbent Glass Mat) batteries are a type of lead acid deep cycle battery. They have been around longer than lithium batteries and are named after the fiberglass mat within them that contains a mixture of water and sulfuric acid. Fully contained, AGM batteries can be used in any orientation without risk of spills or leaking.

What are AGM batteries be used for?

AGM batteries are often used for RVs, marine vehicles and as renewable energy systems because of their deep cycle capabilities. They can withstand repeated deep discharges without sustaining damage and are also known for holding their charge for extended periods of time when they are not in use.

What are the limitations of AGM batteries?

The larger weight and size of AGM batteries can limit their usefulness. They’re not ideal for use when a lighter, compact option is needed. Compared to lithium batteries, they also have a more limited cycle life and lower depth of charge at around 50%.

What are lithium batteries?

Lithium batteries are a relatively new type of battery that uses lithium ions to store and release energy. Compared to traditional lead acid deep cycle batteries, the mechanism of these batteries allows them to be constructed at a lighter and more compact size than traditional batteries at comparable power ranges. They also have faster charging capabilities than AGM batteries and maintain their charge for longer when not in use.

What are lithium batteries used for?

Lithium batteries have a wide range of uses and commonly power electric vehicles, RVs, portable electronics, caravans. They can also be used do solar power. When appropriate, they are a preferred choice for many uses due to their lightweight nature, longer cycle life and cost-effectiveness. They tend to be a convenient choice because of their ability to hold more power for their size, fast-charging capabilities and having a higher number of charge-discharge cycles and extended lifespan.

What are the limitations of lithium batteries?

Lithium batteries have additional features like the battery management system (BMS) that ensures their safe operation. With additional technology like this that comes with lithium batteries it is no surprise that they are the more expensive option when it comes to upfront costs when compared to their AGM counterpart.

Should I choose an AGM or lithium battery?

The choice between the two depends on your usage patterns and specific needs.

If you want to mostly power portable electric devices, and you don’t go out very often, then an AGM battery may be a more cost-effective solution. However, if your plans involve extended off-grid periods and frequent usage, a lithium battery might be the more suitable option.

While AGM batteries generally come at a lower initial cost compared to lithium, it’s important to factor in the requirements for deep cycle capabilities. Also, consider size and weight constraints. If space is limited, AGM batteries may not be the optimal choice for your compact setup.

To summarise, both AGM and lithium batteries have their own advantages and disadvantages. AGM batteries are cost-effective for applications requiring deep-cycle capabilities and are not constrained by size and weight. Lithium batteries can provide faster charging, higher energy density and a longer life cycle. For this reason they also tend to cost more upfront compared to their AGM counterparts. Understanding these differences can help you make an informed decision about what you need from a battery.