AGM vs lithium caravan batteries: which suits your touring setup?

Compare usable energy, not just amp-hours

Two batteries both labelled 100Ah can deliver different usable energy under manufacturer-recommended discharge limits. Nominal capacity alone is not a fair comparison.

LiFePO4 batteries commonly permit deeper discharge than AGM models, but the exact usable capacity depends on the battery specifications, temperature and BMS.

Consider weight and installation

Lithium batteries can be lighter for comparable usable energy, which matters when managing caravan payload. Check dimensions, restraint, ventilation and permitted mounting position.

An AGM-to-lithium upgrade may require changes to DC-DC, solar and mains charging equipment. A direct physical fit does not prove electrical compatibility.

Compare charging and conditions

Battery chemistry affects charge acceptance and charging profiles. Some lithium batteries restrict charging at low temperatures; AGM also has temperature and charging requirements.

Follow the exact manufacturer's installation instructions. Have changes to vehicle or caravan electrical systems assessed by an appropriately qualified professional.

Calculate total ownership cost

Compare purchase price with usable watt-hours, expected cycle life under the relevant test conditions, warranty, charger upgrades and installation.

Do not assume advertised cycle-life numbers guarantee a particular lifespan; real use and operating conditions matter.

Before you buy: checklist

• Daily watt-hour budget
• Usable capacity at manufacturer limits
• Weight and available mounting space
• Existing charger compatibility
• Temperature and BMS protection
• Total installed cost and warranty

Frequently asked questions

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