The battery is of sealed type technology, which allows it to operate without the addition of water or acid. As general-purpose batteries, they are designed to provide reliable performance in a wide range of applications. The sealed lead-acid (VRLA) battery is a type of rechargeable battery with a safety valve that allows the release of internal pressure in case of overcharging. This type of battery is maintenance-free, as it does not require the electrolyte to be topped up with water throughout the battery's lifespan.