Vented Type Lead Acid Batteries

Regulated lead acid vrla batteries.

Vented type lead acid batteries.

Agm batteries are a type of valve regulated lead acid battery. They are maintenance free in the sense of not requiring the addition of water to offset hydrogen gas released during the charging process. Undercharging results in sulfation of the plates. Crown cr430 6v flooded lead acid battery.

These batteries are designed so that hydrogen and oxygen are recombined within the battery rather than being vented. They can be topped up when required and are therefore more tolerant to high temperature operation and over charging. The glass mat in the battery absorbs the hydrogen produced prior to it escaping to the atmosphere allowing it to remain inside the battery. Generally overcharging will boil out the water resulting in cooked batteries that smell very bad.

Valve regulated lead acid vrla batteries are the most widely used battery type because of their high power density and ease of use. Vented lead acid battery high performance batteries are designed to give long services life. Vrla batteries are considered to be sealed because they normally do not allow for the addition or loss of liquid. There are two types for vented or flooded lead acid batteries namely tubular and plante.

An agm battery is constructed by compressing a glass fiber mat between each plate. Most of the battery complies with bs 6290 din40738 and iec standard. For example there are approximately 8 7 kg 19 lb of lead in a typical 14 5 kg 32 lb battery. These products are suitably used by utilities marine oil gas and petrochemical.

The plante battery is both mechanically and electrically more durable. They need to be enclosed and vented to the outside to prevent this gas from being trapped and creating a hazardous environment. Flooded gel agm battery bulging is caused by undercharging. These batteries have a negative and a positive terminal on their top or sides along with vent caps on their top.

For tubular battery normal life is 8 10 years. The free electrolyte also facilitates cooling of the battery. Your batteries likely did not bulge from overcharging all types of lead acid batteries have vents to avoid pressure buildup. Flooded lead acid batteries release toxic hydrogen gas when charging.

Vented lead acid batteries are commonly called flooded spillable or wet cell batteries because of their conspicuous use of liquid electrolyte figure 2. Vented lead acid vla group batteries are all open allowing gas to escape without any positive pressure building up in the cells. A built in valve will release excess gas in case of a severe overcharge. A vented battery can give off sixty times more gas than a vrla battery in normal use.