Tired of heavy AGM batteries that drain too fast and take forever to charge? If you’re considering an upgrade to lithium deep cycle batteries, you’re not alone.
Many 4×4, caravan, and off-grid users are making the switch to LiFePO4 (Lithium Iron Phosphate) batteries. It’s because they’re lighter, more efficient, and last much longer than AGM deep cycle batteries.
But before you replace your old battery, there are a few important things you need to consider. Like compatibility, installation, and safety. This upgrade guide will help you explore everything you need to know. From choosing the right charger to installation tips and safety considerations. Let’s get started.
Why Switch from AGM to Lithium?
AGM (Absorbed Glass Mat) batteries have been a popular choice for off-grid power, caravans, and 4×4 setups for years. But lithium batteries are now the preferred option due to several advantages (we’ve mentioned below).
But, how exactly do lithium batteries compare to AGM? Let’s break it down:
AGM vs. Lithium Battery | Quick Comparison
| Feature | AGM Battery | Lithium Battery | Key Benefit |
| Weight | Heavy | Up to 50%-70% lighter | Easier to transport & install |
| Lifespan | 3-5 years (500-1000 cycles) | 10+ years (3000-5000 cycles) | 5x longer life, fewer replacements |
| Depth of Discharge (DoD) | ~50% usable capacity | ~80-100% usable capacity | More usable power per charge |
| Charging Speed | Slower | Charges faster | Less downtime, more efficiency |
| Maintenance | Requires maintenance | Maintenance-free | No hassle, no extra costs |
| Cost Over Time | Higher due to replacements | Lower due to longevity | Long-term savings |
As you can see from the table, lithium batteries may cost more upfront but shine when it comes to performance and longevity. For instance, a 12v lithium battery will give you almost double the usable power compared to a Deep Cycle AGM Battery of the same size.
But there’s more to why you should consider upgrading to Lithium Deep Cycle Batteries.
7 Key Benefits of Lithium Batteries
Let’s explore the major benefits of switching from AGM to Lithium Deep Cycle batteries. So, you can understand why this change is worth it!
1. Longer Battery Lifespan
One of the biggest reasons to switch to Lithium Batteries is their extended lifespan.
Lithium or AGM batteries vary significantly in terms of longevity. Lithium batteries last 5-10 times longer than their lead-acid counterparts. With a depth of discharge of up to 80-100%, you’ll be able to drain them further without damaging the battery. Giving you more usable energy over the long term.
On top of that, you’ll find yourself replacing lithium batteries far less frequently, saving you a lot of time and money down the road.
2. Smaller Battery Size
Space is always a premium. Especially when it comes to battery storage.
Here’s the best thing: lithium batteries are smaller and more compact than AGM Deep Cycle batteries. This means they can fit into tighter spaces, providing more flexibility for your setup. Whether you’re retrofitting a dual battery system in your RV or upgrading your 4×4 dual battery system, lithium batteries are an ideal choice for making the most out of your available space.
Our Lithium camping batteries are up to 25% smaller in size, which makes them perfect for any application where space matters.
3. Lighter Weight
Carrying a heavy battery around is a pain. Fortunately, lithium batteries are much lighter; up to 55% lighter than traditional AGM Deep Cycle batteries at the same capacity.
This weight reduction not only makes transporting and installing the batteries a breeze. But it also contributes to improved performance in weight-sensitive applications like boating, golf carts, and 4x4s.
A lighter battery means better handling and overall efficiency. Especially in vehicles where weight impacts performance.
4. Deeper Depth of Discharge (DoD)
One of the most significant advantages of switching to lithium is their ability to discharge more deeply compared to AGM batteries.
An AGM Deep Cycle battery can only be safely discharged up to 50%. Whereas, a lithium battery can safely discharge to 80–100% without suffering any damage.
Example:
A 100Ah AGM battery will only give you 50Ah of usable capacity., But a 100Ah lithium battery provides you with the full 100Ah. Essentially giving you double the usable power from the same capacity. For anyone relying on dual battery setups or lithium camping batteries, this is a game-changer.
5. Maximised Efficiency for Great Performance
Lithium-ion batteries are known for their higher efficiency compared to AGM batteries.
They store and discharge energy more efficiently. This reduces energy loss and maximises the usable power for your system. It means you can get more power for your money and enjoy better performance in your 4×4 dual battery system, camping setup, or any other application.
Because lithium batteries operate at higher efficiency, they’ll also be less prone to energy wastage. This makes sure you get more from every amp-hour.
6. Zero Maintenance
Lithium batteries are incredibly low-maintenance, with no need for regular upkeep or care. AGM Deep Cycle batteries still require some attention to ensure optimal performance. They need to be topped up with distilled water. And they only last for a limited number of charge cycles.
Whereas, Lithium Deep Cycle batteries require no maintenance which makes them more convenient, reliable, and cost-effective in the long run. Once installed, you can pretty much forget about them while enjoying consistent, worry-free performance.
7. Consistent Power
Lithium batteries are built to deliver consistent power throughout their entire discharge cycle.
As the battery discharges, lithium batteries maintain steady output. Whereas, AGM batteries experience a decline in power as the battery drains.
This steady power delivery is especially important for high-power applications. Like trolling motors, golf carts, and off-grid setups, where performance can’t afford to drop halfway through the use. With lithium batteries, you can be sure that the power stays strong until the last drop.
7 Key Factors You Need to Consider Before Switching to Lithium Battery
Before you switch, there are a few key things to consider. You’ll need to check compatibility with your battery charger, understand the installation and mounting requirements, ensure proper ventilation and safety, and choose high-quality lithium cells for the best performance.
Let’s get into the details:
1. Is Your Charger Compatible?
Not all battery chargers work with lithium batteries. AGM chargers typically use a charging profile that doesn’t match lithium requirements. This can lead to inefficient charging or even damage. To ensure safe and effective charging, you need a charger specifically designed for lithium.
Here’s how to check charger compatibility:
- Voltage: Lithium batteries need a charging voltage of 14.2V – 14.6V for a 12V system.
- No Float Charging: Lithium batteries don’t require float charging. In fact, it can overcharge them.
- Adjustable Settings: Look for a charger with a “Lithium Mode” or one that allows you to manually adjust settings.
We recommend the TOPO 30A DC/DC Charger. It features an inbuilt solar regulator for efficient vehicle charging. If your AGM charger isn’t compatible with lithium batteries, it’s worth upgrading to avoid potential issues.
2. Temperature Considerations
Lithium batteries are known for maintaining stable performance across various temperatures. But they won’t charge below 32°F (0°C).
In colder environments, you can insulate the batteries with heating pads or store them in warmer spaces to ensure proper charging. The built-in Battery Management System (BMS) will prevent charging in sub-freezing temperatures. But once they’re warmed up, they’ll perform as expected.
On the plus side, lithium batteries perform better than AGM in high-temperature conditions, making them ideal for more extreme weather.
3. Installation & Mounting – What You Need to Know
Lithium batteries are more compact and lighter than AGM batteries. This means you may need a new mounting kit. Their small size allows them to fit into tighter spaces. Perfect for cramped areas like behind seats or under vehicle flooring. But lithium batteries must be installed in a sealed and vented space if they’re inside the vehicle, as per the AS/NZ 3001 standards.
Let’s have a look at the quick installation tips:
- Avoid Heat: Don’t place the battery in direct sunlight or near heat sources.
- Secure the Battery: Use brackets or straps to keep the battery stable.
- Parallel or Series: Follow the manufacturer’s guidelines for safely wiring multiple batteries.
- Use the Right Cables: Ensure your wiring can handle higher discharge rates.
4. Do You Need a New Battery Monitor?
Traditional battery monitors that display voltage as a percentage won’t work with lithium batteries due to their unique discharge characteristics.
To get the most accurate readings, invest in a quality battery monitor that tracks both voltage and real-time power estimates. This will help you avoid running out of power unexpectedly.
5. Proper Ventilation & Safety – Is Your Setup Compliant?
Unlike AGM batteries, lithium batteries don’t release harmful gases. So, ventilation isn’t necessary. But it’s still important to ensure that your lithium batteries are safely installed in a well-ventilated area, free from heat and liquid exposure. Always choose batteries that include a built-in BMS to protect against issues like overcharging or overheating.
Let’s go through some safety installation tips:
- Temperature Control: Avoid extreme heat; install in a controlled environment.
- Built-in BMS: Make sure your battery has a Battery Management System (BMS) to prevent overcharging, overheating, short circuits, and deep discharge.
- No Ventilation Required: Lithium batteries can be safely installed in enclosed spaces.
6. Lithium Battery Cell Quality
The quality of the cells inside your lithium battery matters. Look for A-grade LiFePO4 cells that meet the IEC 62619 standards. Purchasing from a reputable brand that offers a solid warranty ensures your battery will perform safely and reliably.
So, look for high-quality A-Grade cells for longevity and performance. Remember, a good lithium battery should come with at least a 5-year warranty.
7. Cost Consideration: Is Lithium Worth It?
Lithium batteries have a higher upfront cost. But they save you money in the long run due to their longer lifespan and efficiency. Let’s see how:
Total Cost Over 10 Years (AGM vs. Lithium)
| Battery Type | Initial Cost | Lifespan | Replacements Needed | Total Cost Over 10 Years |
| AGM Battery | $300 | 3-5 years | 2-3 replacements | $900-$1200 |
| Lithium Battery | $900-$1200 | 10+ years | 0 replacements | $900-$1200 |
As you can see, both battery types cost about the same in the long run. But with lithium, you get better performance, lighter weight, and hassle-free operation.
Top Picks for the Best Lithium Batteries at Topo DC Power
We offer a variety of portable 12V Lithium Dual Battery Systems to meet different power needs and budgets. Whether you need a quick charge, long-lasting energy, or something in between, we’ve got a system that’s perfect for you.
Let’s take a closer look at our top lithium dual battery packages.
| Model | Battery Capacity | Features | Included | Link & Price |
| CENTERFIRE – Dual Battery System | 72AH |
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Shop now for Only $1,450 |
| LONG RANGE – Slimline Lithium Dual Battery Power Distribution System | 144AH |
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Shop now for Only $2,550 |
| LONG RANGE – Slimline Lithium Dual Battery System | 144AH |
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Shop now for Only $2,350 |
Tired of heavy, short-lived batteries?
Switch to Lithium Batteries Today | A Smarter Move to More Power, Less Hassle!
At Topo DC Power, we offer top-tier Lithium Dual Battery Systems with DC-DC chargers, solar controllers, and battery monitors—everything you need for a seamless upgrade.
Whether you’re hitting the road, setting sail, or going off-grid, our lithium power systems deliver fast charging, extended battery life, and hassle-free wireless monitoring.
Explore our range of high-quality lithium batteries.