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What is AGM Technology in Batteries?

The AGM technology, which is used in non-woven lead batteries, is highly appreciated as it allows a considerable number of applications. It is suitable for the particular needs of professionals as well as for the general requirements of private customers. You can also have a look at our Best AGM Battery Reviews

1. How does a lead-fleece battery AGM work?

For sealed lead- acid batteries, “VRLA” (VLIES) is often written, meaning “Valve Regulated Lead Acid.” That is, how the battery was developed: it is equipped with a valve that automatically renews the energy production without completing the battery acid (the acid contains the electrolytes).

If it is stated that the lead-acid battery is equipped with AGM technology (“Absorbed Glass Mat”), it means that erasers of glass fiber mats are located between the electrodes in the battery – in which the acid is stored.

All commercial AGM lead batteries are equipped with a gas recombination system. The valves serve only for the escape of the gas. The AGM plates mentioned make it possible to reduce this gas production, since they convert the oxygen into water, then redistribute them back to water in the energy production circuit.

By using AGM technology in a lead-acid battery, the user has a correctly sealed battery to prevent any leakage. If the battery breaks down, there is no danger of acid leakage. Consequently, no maintenance on the battery is necessary because the acid content remains constant.

2. The advantages and disadvantages of the AGM lead battery

All the technologies used in our batteries have their advantages and disadvantages. Before you buy an assault or a battery, it is essential to know how to use the battery and what device it is used for. Remember that there are as many batteries as there are devices and they are used in different ways.

Further information on the different applications of a battery can be found here.

  • Ideal for applications with permanent charge (floating)
  • No maintenance: thanks to the gas recombination system
  • Environmentally friendly: 99% of the lead is recyclable
  • Cheap technology: At high capacity, the price remains affordable
  • Robust technology: good strength in case of overload
  • Not ideal for cyclic applications
  • Some models do not appreciate discharge: when the releases are repeated, the life of the battery is changed.
  • The charge of the battery should be accurate to avoid overcharging and to optimize the service life.

3. When can you use AGM lead batteries?

There are three types of batteries that use AGM: stationary AGM lead batteries, AGM starter batteries, and deep cycle AGM batteries. You will discover the various possible applications and products at All-Batteries.

TypeapplicationsOur catalog
AGM lead battery “floating” mode
  • Battery for inverter
  • Battery for the alarm system
  • Wheelchair battery
  • Lead battery
  • AGM lead battery
AGM battery
  • traction battery
  • Car battery with start & stop option
  • OPTIMA battery
  • FILMES battery
AGM battery deep discharge
  • Battery for Golf Trolley
  • Solar battery

4. For which applications does AGM technology offer the best performance?

The AGM technology is ideal for stationary use: in “Floating” mode and installed in a UPS, these batteries are suitable for being charged continuously. In the event of a power failure, the AGM lead-acid batteries supply power to your devices. 

According to your needs, it may be advisable to consider the following criteria:

  • A lifetime in Floating Mode from 8 years & more.
  • Value for money: appreciate the range of deep-cycle AGM batteries.

These batteries have the same qualities as gel batteries and are, moreover, more tolerant of handling errors.

AGM batteries have many advantages over conventional lead-acid batteries and gel batteries:

  • Better capacity  – These batteries allow, for the same size, to obtain maximum intensities (CCA) identical to or higher than those of conventional starter batteries (indeed, ions circulate better in this type of electrolyte).
  • A faster-charging cycle  – The charge cycle time is reduced overall. With equal capacity, the charging and discharging intensity are higher than with a liquid battery. Indeed, the fact that the electrodes are compressed ensures a natural mechanical strength of the plates and avoids having to oversize the electrodes. Also, the addition of lead additives being lower than a conventional battery, the phenomenon of corrosion (more pure wire) and the generation of gas are significantly reduced.
  • More comfortable transport  – The electrolyte is soaked in the fiber and therefore can not flow, even if the battery case breaks down. Transport is much more comfortable and safe. These batteries can be placed in any position (since they can not sink)
  • Resistance to frost and cold  – Since they contain no liquid, AGM batteries are very insensitive to the damaging effects of freezing.
  • More accessible storage  – AGM batteries are of the “recombinant” type. This means that oxygen and hydrogen bind and loose inside the battery without any off-gassing on the outside. The gaseous phase, when charging the battery, transfers the oxygen to the negative plates to transform it into the water, which avoids any reduction or loss of water (efficiency greater than 99% making negligible the loss of water).
  • Maintenance-free storage and virtually zero self-discharge  – AGM batteries have a shallow self-discharge rate, in the range of 1% to 3% per month. This rate, particularly small, allows them to be stored for long periods without the need to recharge them frequently (as required by standard batteries).
  • Full compatibility with all types of installations  – The charging voltage of AGM batteries is the same as conventional lead-acid batteries. No particular adjustment is to be expected, regardless of the nature of the regulator used during charging (charger, alternator, solar panel, wind turbine, etc.).
  • The high flexibility of use  – The internal resistance of AGM batteries is extremely low. These batteries emit very little internal heat during charging or discharging cycles. This feature allows great flexibility in charge and discharge rates
  • Uncompromising safety standards  – The hydrogen emission rate, in case of a massive overload (defective or non-existent regulator), remains below 4%. This rate corresponds to the strict rules imposed in aviation and necessary in the case of use in confined space.
  • Outstanding Physical Resistance  – Shock and vibration resistance is significantly higher than conventional batteries because AGM battery plates are very tightly compressed and securely attached to the top and bottom of the cell.

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