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When it comes to choosing a lithium battery for camping, most people quickly find themselves comparing two options: LiFePO4 and AGM. Both store power, but they work differently and the right choice depends on how you travel. Here is an honest side-by-side comparison.

You can browse our full lithium battery range at Campalot but first, here's what you actually need to know about how these two technologies compare in the real world.

What Is an AGM Battery?

AGM stands for Absorbent Glass Mat. It's a type of sealed lead-acid battery that's been the standard in touring setups for decades. AGM batteries are reliable, widely available, compatible with most existing charging systems, and cost less upfront than lithium.

They work well for light or occasional use. For a weekend camper who spends most nights at powered sites, an AGM does the job without complaint.

What Is a LiFePO4 Lithium Battery?

LiFePO4 (Lithium Iron Phosphate) is the safest and most stable form of lithium chemistry, the reason it's become the standard for camping and touring applications. Unlike lithium-ion batteries in phones or laptops, LiFePO4 doesn't overheat easily and is far less prone to thermal runaway.

Modern LiFePO4 batteries include a built-in Battery Management System (BMS) that protects against overcharging, over-discharge, short circuits and temperature extremes. They're also significantly lighter, faster to charge and longer-lasting than AGM.

The Key Differences

Usable Capacity

This is the big one. An AGM battery should only be discharged to around 50% to protect its lifespan. So a 100Ah AGM gives you roughly 50Ah of usable power.

A LiFePO4 battery can safely discharge to 80 to 100% of its rated capacity. That means a 100Ah lithium effectively delivers what a 160 to 200Ah AGM would. For the same physical size and weight, you get far more usable energy.

Weight

Lithium batteries are roughly 40 to 50% lighter than comparable AGM. A 100Ah AGM typically weighs around 26 to 30kg. The equivalent lithium comes in at 10 to 13kg. For anyone managing payload in a 4WD or keeping a van under its tow rating, that difference is very real.

Lifespan

AGM batteries typically last 300 to 500 charge cycles before capacity degrades significantly. LiFePO4 batteries are rated for 2,000 to 4,000+ cycles. In practical terms, a quality lithium battery can outlast 5 to 8 AGM batteries over the same period, which often makes it the more economical choice over time despite the higher upfront cost.

Charge Speed

Lithium accepts charge much faster than AGM. It can handle a higher charge rate without damage, which means your solar panels or DC-DC charger can recover more energy in less time. On overcast days or short driving stints, this makes a genuine difference.

Upfront Cost

AGM wins here. A quality 100Ah AGM costs roughly $150 to $300. A comparable LiFePO4 starts at around $400 to $600. If budget is tight right now and you're building a basic weekend system, AGM is a fair starting point. But for anyone planning extended touring, the lithium investment pays for itself.

Charging Compatibility

AGM batteries work with virtually any existing charging system. LiFePO4 batteries require a lithium-compatible charger, DC-DC charger and MPPT solar controller. If you're retrofitting lithium into an older setup, check your charging gear before you buy.

Which Should You Choose?

Choose AGM if...

• You're on a tight upfront budget.
• You camp primarily at powered sites and don't lean heavily on your battery bank.
• You have AGM-compatible gear and aren't ready to upgrade the charging system.
• You use your setup lightly, a few weekends a year.

Choose LiFePO4 lithium if...

• You're planning extended touring, a Big Lap, or full-time travel.
• You want maximum usable capacity in the smallest, lightest package.
• You're running a large fridge, Starlink, a CPAP, or other high-draw devices.
• You want a battery that lasts the trip without replacement.
• You're building a proper solar system and want fast, efficient recharging.

The majority of serious tourers we talk to make the switch to lithium and don't look back. The performance difference in real-world use is hard to argue with once you've experienced it.

One Note on Compatibility

If you're upgrading to lithium, make sure your charger supports LiFePO4 chemistry. Older AGM chargers can run a charging profile that damages lithium batteries over time. Most modern DC-DC chargers and MPPT controllers handle both, but it's worth confirming before you commit.

The Short Version

LiFePO4 gives you more usable power, less weight, longer life and faster charging. AGM costs less upfront and is more forgiving if you have an older system.
For anyone doing serious touring, the move to lithium makes sense. For occasional use on a budget, AGM still does a decent job. Still not sure? Get in touch, we'll help you work it out.

  Explore our lithium battery range at Campalot; 100Ah, 200Ah and 300Ah+ options built for Australian touring.  campalot.com.au/collections/lithium-batteries