Lithium leisure batteries are becoming increasingly popular because they can be discharged much deeper than lead acid batteries. For an AGM battery, we’d recommend 65-80% as a sensible, regular depth of discharge. Most battery manufacturers will suggest a maximum DOD of around 50% for sealed lead acid batteries, but it’s also down to personal choice and consideration of how long you want the battery to last. In fact, there’s actually a direct correlation between how deeply a battery is discharged, and how long the battery will last for. This is especially true of lead acid batteries, which can be irreparably damaged if they are fully discharged. Using a leisure battery without a battery monitor is like driving a car without a fuel gauge: it will work perfectly fine, until it doesn’t! And just like an engine, a leisure battery can be damaged if it’s fully drained.
They’re an essential bit of kit for pretty much everyone, but especially anyone planning to steer away from campsites and rely on their leisure battery for power. Installing a leisure battery monitor in your campervan will help you get the most out of your battery’s capacity and lifespan. If 50Ah has been drawn from a fully charged battery with a 200Ah capacity: This describes how much capacity the battery still has to offer, relative to its original capacity when it was fully charged.
Different monitors will measure different parameters, such as temperature or voltage, but a basic, good quality battery monitor will measure and display the battery’s state of charge. A battery monitor does exactly what it says on the tin – it monitors your leisure battery.
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