Vented Type Lead Acid Batteries

Your batteries likely did not bulge from overcharging all types of lead acid batteries have vents to avoid pressure buildup.

Vented type lead acid batteries.

Most of the battery complies with bs 6290 din40738 and iec standard. Vented lead acid vla group batteries are all open allowing gas to escape without any positive pressure building up in the cells. Vrla batteries are considered to be sealed because they normally do not allow for the addition or loss of liquid. A vented battery can give off sixty times more gas than a vrla battery in normal use.

About 60 of the weight of an automotive type lead acid battery rated around 60 a h is lead or internal parts made of lead. Vented lead acid battery high performance batteries are designed to give long services life. Valve regulated lead acid vrla batteries are the most widely used battery type because of their high power density and ease of use. A built in valve will release excess gas in case of a severe overcharge.

There are two types for vented or flooded lead acid batteries namely tubular and plante. They need to be enclosed and vented to the outside to prevent this gas from being trapped and creating a hazardous environment. They are maintenance free in the sense of not requiring the addition of water to offset hydrogen gas released during the charging process. These products are suitably used by utilities marine oil gas and petrochemical.

They can be topped up when required and are therefore more tolerant to high temperature operation and over charging. Flooded gel agm battery bulging is caused by undercharging. For example there are approximately 8 7 kg 19 lb of lead in a typical 14 5 kg 32 lb battery. These batteries have a negative and a positive terminal on their top or sides along with vent caps on their top.

An agm battery is constructed by compressing a glass fiber mat between each plate. Vented lead acid batteries are commonly called flooded spillable or wet cell batteries because of their conspicuous use of liquid electrolyte figure 2. The difference between the two is the construction. The glass mat in the battery absorbs the hydrogen produced prior to it escaping to the atmosphere allowing it to remain inside the battery.

For tubular battery normal life is 8 10 years. The plante battery is both mechanically and electrically more durable. Regulated lead acid vrla batteries. Crown cr430 6v flooded lead acid battery.

Agm batteries are a type of valve regulated lead acid battery. The free electrolyte also facilitates cooling of the battery. These batteries are designed so that hydrogen and oxygen are recombined within the battery rather than being vented. Generally overcharging will boil out the water resulting in cooked batteries that smell very bad.