The Truth About Lithium Batteries for Van Life

If you’ve been researching van electrical systems, you’ve probably heard plenty of buzz about lithium batteries. They promise more power, longer life, and better performance than traditional AGM or lead-acid batteries. But are they really worth the investment for your van build? At Oxbow Vans, we install and maintain hundreds of off-grid electrical systems every year, and here’s the truth about lithium batteries based on real-world experience.

1. Lithium Batteries Deliver More Usable Power

One of the biggest advantages of lithium (LiFePO₄) batteries is usable capacity. With a traditional AGM battery, you can only safely use about 50 percent of the total power before damaging it. Lithium batteries, on the other hand, can be discharged up to 80 or even 90 percent without harm.

That means a 200-amp-hour lithium battery gives you nearly the same usable energy as a 400-amp-hour AGM bank. You get more power in less space and weight, which matters a lot in a van.

2. They’re Lighter and Smaller

Every pound matters when you’re climbing mountain passes or trying to stay under your van’s payload limit. Lithium batteries weigh about half as much as equivalent lead-acid batteries. They also take up less room, leaving more space for gear, storage, or extra water tanks.

For most Oxbow builds, we find that the weight savings alone can make a noticeable difference in how the van handles and accelerates.

3. They Last Years Longer

Lithium batteries typically last three to five times longer than AGM batteries. A good lithium bank can provide 3,000 to 5,000 full charge cycles before showing noticeable decline, while lead-acid batteries often need replacement after 500 to 800 cycles.

That longevity means the higher upfront cost often pays off in the long run. You’ll spend more at first, but less over time on replacements and maintenance.

4. Temperature Matters

Here’s where lithium gets a little tricky. These batteries don’t like extreme cold or heat. Charging them below freezing can cause permanent damage, and excessive heat shortens their lifespan.

That’s why at Oxbow, we always include temperature monitoring and low-temp charging protection in every lithium system we install. For customers who plan to travel or store their van in cold climates, we often recommend heated lithium batteries or a climate-controlled battery compartment.

5. They Require the Right Charging Setup

You can’t just swap in lithium batteries and call it good. They need compatible charging equipment and proper system settings. That means a lithium-compatible battery monitor, charger, and solar controller—like those from Victron Energy, which we trust and use in nearly all our builds.

When set up correctly, lithium systems are safe, reliable, and almost maintenance-free. When done incorrectly, they can be over-charged or under-protected. That’s one reason professional installation matters.

6. The Real Cost Comparison

Yes, lithium batteries cost more upfront. But when you compare total lifespan and usable power, the math tells a different story.

Let’s say you buy a 200-amp-hour AGM setup for $600 and it lasts 3 years. A 200-amp-hour lithium setup might cost $1,800 but last 10 years or more. You end up paying less per usable amp-hour over time, plus you gain efficiency, lower weight, and better performance.

7. Our Take at Oxbow Vans

For serious off-grid travelers, full-time van lifers, and anyone who wants dependable power for years of adventure, lithium batteries are absolutely worth it.

If you mostly camp at hookups or take occasional weekend trips, AGM batteries can still make sense and save money upfront. But if you’re building a van meant to roam freely, go off-grid, and last, lithium is the clear choice.

We’ve tested nearly every major brand on the market, and we continue to rely on Victron Energy components and Expion lithium batteries for their reliability, safety features, and support. Every Oxbow electrical system is designed to fit your specific travel style, climate, and energy needs.

Ready to Power Your Adventures?

If you’re planning your van build or looking to upgrade your electrical system, our team can help you choose the right components and design a setup that fits your travel goals.

Reach out to Oxbow Vans to talk through your options and start building a system that keeps you powered wherever the road takes you.