VRLA batteries offer several advantages compared with flooded lead-acid cells.

VRLA batteries immobilize the electrolyte, usually by one of two means:

The cell walls of VRLA batteries typically swell when the internal pressure rises.

Gel VRLA batteries are best for this purpose.

VRLA batteries are commonly further classified as:

VRLA batteries are used extensively in power wheelchairs, as the extremely low gas and acid output makes them much safer for indoor use.

VRLA batteries:

Since VRLA batteries do not require (and make impossible) regular checking of the electrolyte level, they have been called maintenance free batteries.

Wet cells have open vents to release any gas produced, and VRLA batteries rely on valves fitted to each cell.

For higher-powered lights, an external battery pack of 12V VRLA battery is often required.

Constant-voltage charging is the usual, most efficient and fastest charging method for VRLA batteries, although other methods can be used.

This sealed, non-spill feature made it possible to make very small VRLA batteries (1 -12 Amp hr.

The VRLA battery uses an immobilized sulfuric acid electrolyte, reducing the chance of leakage and extending shelf life.

VRLA batteries are also used in the UPS (uninterruptible power supply) as a back up when the electrical power goes off.

Because of their construction, VRLA batteries do not require regular addition of water to the cells, and vent less gas than flooded lead-acid batteries.

The electrical characteristics of VRLA batteries differ somewhat from wet-cell lead-acid batteries, requiring caution in charging and discharging.

The sealed valve regulated lead-acid battery (VRLA battery), popular in the automotive industry as a replacement for the lead-acid wet cell.

A VRLA battery (valve-regulated lead-acid battery) more commonly known as a sealed battery is a lead-acid rechargeable battery.

Because AGM VRLA batteries use much less electrolyte (battery acid) than traditional lead-acid batteries, they are sometimes called an "acid-starved" design.

GR-4228, VRLA Battery String Certification Levels Based on Requirements for Safety and Performance, is a new industry-approved set of VRLA requirements that provides a three-level compliance system.

A gel battery (also known as a "gel cell") is a VRLA battery with a gelified electrolyte; the sulfuric acid is mixed with silica fume, which makes the resulting mass gel-like and immobile.

VRLA batteries are used in the outside plant at locations such as Controlled Environmental Vaults (CEVs), Electronic Equipment Enclosures (EEEs), and huts, and in uncontrolled structures such as cabinets.

As long as the ripple current is not excessive (more than 3 to 4 times the battery-manufacturer-recommended level), the expected life of a ripple-charged VRLA battery is within 3% of the life of a constant DC-charged battery.

Apart from the conventional Flooded Flat Plate batteries for Automotive application, Exide also produces industrial range of batteries, which includes, Flooded - Flat plate, Flooded - Tubular plate, Flooded - Plante and Sealed Maintenance Free VRLA batteries.

The compliance system provides a common framework for evaluating and qualifying various valve-regulated lead-acid battery technologies.

A valve-regulated lead-acid battery (VRLA) is a battery type that is popular in telecommunications network environments as a reliable backup power source.

A VRLA battery (valve-regulated lead-acid battery) more commonly known as a sealed battery is a lead-acid rechargeable battery.

Other electric systems include 12 volt lighting with valve-regulated lead-acid batteries since they can also provide power for air compressors that fit in automotive cigar lighter receptacles when tires go flat.

The company Accumulatorenfabrik Sonnenschein had been founded in Berlin in 1910 by Theodor Sonnenschein, and had patented the gel-cell type of valve-regulated lead-acid battery in 1957.

Other advantages it offers is the potential ability to power a PC off a sealed lead-acid 12 volt battery, or from automotive power without using a power inverter.

Valve-regulated lead-acid (VRLA) batteries, usually known as sealed lead-acid, Gel, or AGM batteries, minimize the risk of spillage, and gases are only vented when the batteries are overcharged.

To keep the Gel Cell at full charge, if I miss a couple weekends."

Initially, standard flooded golf cart batteries were used, replaced in later models by Sonnenshein gel cells.

The system was powered by a gel cell battery that lasted for twelve hours, which enabled Fricke to shoot without the use of a generator.

A gel cell has the electrolyte mixed with silica dust to form an immobilized gel.

But for wedding photographers and paparazzi used to lugging around heavy high-voltage batteries, these modern "gel cells" are a blessed relief.

Gel batteries (or "gel cell") use a semi-solid electrolyte.

These batteries are deep cycle sealed GEL cell batteries that are non-hazardous and fully recyclable.

Gel battery ("gel cell") An absorbed glass mat battery has the electrolyte absorbed in a fiber-glass mat separator.

Non-Automotive Lead-Based Batteries Gel cells and sealed lead-acid batteries are commonly used to power industrial equipment, emergency lighting, and alarm systems.

A sealed lead acid battery or gel cell is a lead acid battery that has the sulfuric acid electrolyte coagulated (thickened) so it cannot spill out.

The absorbed glass mat (AGM) type uses a glass mat separator, and a "gel cell" uses fine powder to absorb and immobilize the sulfuric acid electrolyte.

Wet cells are still used in automobile batteries and in industry for standby power for switchgear, telecommunication or large uninterruptible power supplies, but in many places batteries with gel cells have been used instead.

A gel battery (also known as a "gel cell") is a VRLA battery with a gelified electrolyte; the sulfuric acid is mixed with silica fume, which makes the resulting mass gel-like and immobile.

The basic principle has not changed since 1859, though in the 1970s a variant was developed that used a gel electrolyte instead of a liquid (commonly known as a "gel cell"), allowing the battery to be used in different positions without failure or leakage.