AGM vs Lithium for Campervan:
Which Should You Choose in 2026?
Best Campervan Battery: AGM vs Lithium Compared
Our honest guide from people who have actually lived with both battery types. If you’re gearing up for vanlife, a festival or camping, you’ll need a reliable battery setup to keep the lights on, the fridge cold and of course keep the beers coold. It doesn’t mather if you are building campervan by converting a van, or renovating your RV. The million dollar question remains: should you go lithium or stick with the old faithful AGM batteries?
Both have their place, but the choice really depends on how you travel, how long you want to stay off the grid and what gear you want to run.
When we built our first campervan, choosing a leisure battery felt surprisingly difficult.
Every Facebook group seemed to have a different opinion. Some people swore by AGM batteries because they were “tried and tested”. Others claimed lithium batteries were the only sensible option and that AGM was already outdated. And not to forget, the price difference between them.
The problem was that much of the advice was based on information that was several years old. Back then, lithium batteries were pretty “new” on the marked and therefor often two or even three times more expensive than AGM batteries. For many DIY builders, that price difference alone made the decision easy. show where the money usually goes, explain the biggest budget mistakes, and help you estimate your own conversion budget.
Today things look very different. Lithium prices have dropped dramatically the last years. The battery technology and safty has improved a lot and many of the old arguments for AGM simply don’t carry the same weight anymore. At least not for us. That doesn’t mean AGM batteries are useless. They still have a place in certain builds. But for most campervan owners in 2026, the answer is much clearer than it used to be.
In this guide we’ll compare AGM and lithium batteries side by side, explain the real-world differences, and help you decide which option makes the most sense for your build.
Why Your Leisure Battery Matters More Than You Think
So let’s break it down in plain English, no boring tech jargon, just the stuff that matters when you’re out in the sticks.
When people start planning their campervan to build their electrical system, they often focus on solar panels first. And we did the same, solar panels are visible. They’re there for exciting. They’re easy to show off in photos and everybody on Instagram has them.
But it’s easy to forget that it’s your battery is actually the heart of the entire electrical system. Without enough usable battery capacity, it doesn’t matter how many solar panels you install. Eventually the sun goes down, clouds roll in or you spend a few days with rain.
That’s when your battery becomes the difference between enjoying your trip and constantly worrying about power. A good leisure battery allows you to charge phones, run lights, power a fridge, use a diesel heater and stay off-grid for longer periods without stress.
A poor battery setup often becomes the thing people wish they had upgraded sooner.
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What Is The Difference Between AGM and Lithium Batteries?
At first glance, AGM and lithium batteries seem very similar.
- Both store energy.
- Both connect to your campervan electrical system.
- Both can be charged using solar panels, DC-DC chargers and mains chargers.
The difference is how efficiently they do those jobs.
AGM batteries are a type of lead-acid battery. They’ve been used for decades and have built a reputation for being reliable and relatively affordable. Lithium batteries, usually LiFePO4 batteries in campervans, are much newer. They offer higher usable capacity, lower weight, faster charging and significantly longer lifespans.
If you only compare sticker prices, AGM often looks attractive. If you compare what you actually get over ten years of ownership, lithium usually wins.
Battery Weight and Size:
Weight is a massive deal, every kilo counts. AGM batteries weight roughly twice as much as a lithium battery, and lithium takes at the same time up less space. For instance, you may find a 12V 300Ah AGM battery sits around the 70kg. At the same time a 12V 300Ah Lithium battery may be closer to the 30-35kg range.
Not only does it give you more payload for gear, water and passengers, but it’s also much easier to install. Anyone who has tried lifting a large AGM battery into a tight battery compartment will know exactly what I’m talking about.
So if you’re trying to keep under your caravan’s payload limit, lithium frees up weight for more important things, like beer, fishing gear, or that portable aircon.
AGM vs Lithium: The Real-World Comparison, 12v, 120ah
| Feature | AGM | Lithium (LiFePO4) |
| Usable Capacity | Around 50% | 80-100% |
| Weight | 30-35kg. | 12-14kg |
| Lifespan | 500-1 200 cycles | 3 000-8 000 cycles |
| Charging Speed | Slow | Fast |
| Cost Upfront | Lower, 250-350€ | Higher, 600-900€ |
| Cost Over Time | Higher | Lower |
| Cold Weather | Better without heating | May require heating below freezing |
| Suitable for Solar | Yes | Excellent |
Looking purely at specifications, lithium wins almost every category.
The only areas where AGM still has an advantage are lower upfront cost and slightly simpler cold-weather operation. But remember: lithium lasts more life-cycles and gives you nearly double the usable energy. Over the lifespan, lithium usually ends up cheaper per cycle. For everything else, lithium is generally ahead.
The Biggest Difference: Usable Capacity
This is the part many first-time builders miss. A 100Ah AGM battery is not really a 100Ah battery. This is where lithium really shines. With AGM batteries shouldn’t regularly be discharged below 50% of the battery’s rated capacity. Go lower and you’ll shortsen the batteris lifetime. That means your usable capacity is actually closer to 50Ah.
A 100Ah lithium battery can comfortably provide 80-100Ah of usable energy without significantly affecting lifespan. But as always, read your batteries guide to determine the best range.
In practical terms:
This was one of the biggest surprises when we started comparing systems properly. Many builders think AGM is cheaper because the battery itself costs less. But once you account for usable capacity, the numbers start looking very different.
Charging Speed:
While traveling no one wants to waste half a day waiting for batteries to top up. Lithium batteries accept charge much quicker, especially from solar. Especially when you are in a hurry and have a limited amount of sunlight.
Lithium: Can take full amps right up until nearly full, meaning faster recovery.
AGM: Slower to recharge, especially after 80% full.
Which Battery Is Best For Weekend Trips?
- Weight and size isn’t an issue.
- You’re on a budget and want to build a cheaper van.
- You only camp a few weekends a year.
- Have a good DC-DC charger or solar panels
Victron has built a strong reputation within the campervan community and their AGM batteries remain among the most reliable options available. That said, even weekend users are increasingly choosing lithium simply because the price difference has become much smaller. If you’re building a van today and plan to keep it for several years, we’d still lean towards lithium.
Go Lithium if:
- Have a good DC-DC charger or solar panels
- Weight and size isn’t an issue.
The result is that many lithium batteries now cost only slightly more than a comparable AGM setup while lasting several times longer. That’s a difficult argument for AGM to compete against.
Go Lithium if:
- Have a good DC-DC charger or solar panels
- Weight and size isn’t an issue.
The result is that many lithium batteries now cost only slightly more than a comparable AGM setup while lasting several times longer. That’s a difficult argument for AGM to compete against.
Final Verdict – What Would We Choose Today?
If this article had been written five years ago, the answer would have been less clear. Back then AGM batteries still had a strong place in the campervan world. But in 2026, things have changed.
For most campervan and RV owners, lithium batteries now offer better performance, lower long-term cost, more usable capacity and a far better overall experience. If you’re building your first campervan and wondering which battery technology to choose, our recommendation is simple: Choose lithium if your budget allows it.
Go AGM if:
- Weight and size isn’t an issue.
- You’re on a budget and want to build a cheaper van.
- You only camp a few weekends a year.
- Have a good DC-DC charger or solar panels
Go Lithium if:
- You travel often or full-time.
- You rely heavily on 12V gear like fridges, lights, inverters.
- You want the lightest, longest-lasting setup.
What we recommend
Our Recommended AGM Battery
If you still prefer AGM technology, we’d look at the AGM DEEP CYCLE BATTERY.
Victron has built a strong reputation within the campervan community and their AGM batteries remain among the most reliable options available.
Our Recommended Budget Lithium Battery
For builders trying to maximise value for money, the ECO-WORTHY 100AH LIFEPO4 BATTERY or 280AH LIFEPO4 BATTERY is currently one of the most interesting options on the market. For many first-time campervan builders, this is where we’d start looking.
If you are in need of a bigger battery here is a 300ah lithium battery.
Our Recommended Premium Lithium Battery
If you’re building a serious off-grid campervan, we’d look at the VICTRON LIFEPO4 BATTERY
Both offer excellent performance, integrated battery management systems and the kind of reliability you want when you’re relying on your electrical system every day.
Final Verdict – What Would We Choose Today?
If this article had been written five years ago, the answer would have been less clear. Back then AGM batteries still had a strong place in the campervan world. But in 2026, things have changed.
For most campervan and RV owners, lithium batteries now offer better performance, lower long-term cost, more usable capacity and a far better overall experience. If you’re building your first campervan and wondering which battery technology to choose, our recommendation is simple: Choose lithium if your budget allows it.
It’s one of the upgrades you’re least likely to regret later.
Want To Learn More?
- Campervan Electrical System Learn how batteries, solar panels, DC-DC chargers and inverters work together to power your van safely and reliably.
- How to choose the right leiuser battery for RV Deep dive how to choose the right battery for your van.
- Choosing the Right Van for Conversion Compare popular models such as the Ford Transit, Mercedes Sprinter and Volkswagen Crafter before committing to a purchase.
- DC-DC Charger Guide Understand why modern campervans need a DC-DC charger and how to choose the correct size for your setup.
