Also known as ‘Valve regulated batteries’, these are a lead-acid batteries that are sealed to prevent gases or fluids leaking from the battery.
SLA batteries have a built-in pressure relief valve that releases gas if the internal pressure is too much. This is why they are viewed as the safest car batteries available today.
These are commonly found in lower spec models of cars.
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They are built in a similar way to AGM batteries, as they also use absorbent glass mats in some of their designs.
Other SLA batteries use a gelled electrolyte solution, rather than the mat – but they are designed to avoid any leaks or spills.
However, SLAs are viewed as ‘maintenance-free’ options – however, this doesn’t mean that car owners shouldn’t be regularly checking their battery and other key components.