![]() On the other hand, NiCd UPS batteries are far more expensive than the more traditional VRLA variety. NiCds offer the advantages of a 20-year design life, the ability to handle a wide ambient temperature range (-20☌ to +40☌), a high cycle life and tolerance to deep discharges. The battery electrodes are made up of nickel hydroxide on the positive plate and cadmium hydroxide on the negative plate. Nickel-Cadmium (NiCd) batteries used to be a popular option for telecoms installations, while they are still used for UPS applications in locations with very high ambient temperatures, particularly the Middle East. VLA batteries are also more expensive than the VRLA alternative. They can’t be used in cabinets or racks, which means they aren’t suitable for office environments or data centre installations. ![]() Because they are top-vented, they must also be kept upright, with the water levels manually topped up. To overcome these risks, VLA batteries must be placed in a dedicated room with wash-down facilities in case of acid leaks. This means installations using VLA batteries require more powerful ventilation systems and can pose a greater safety hazard. They have a long design life (up to 20 years) and are typically used in large installations needing a high ampere-hour (Ah) rating.īecause they aren’t sealed, any hydrogen generated escapes directly into the environment. It does offer advantages in terms of a wider operating temperature range (-40☌ to +55☌) and extended design life.Īlso known as Flooded, these batteries have plates that are flooded with electrolyte acid. There are two main types of electrolyte composition used in a VRLA UPS battery: Absorbed Glass Mat (AGM), where the electrolyte is held in a porous microfiber glass separator and Gel, which is made from a mix of sulphuric acid and silica.ĪGM technology is the norm for UPS batteries because of its lower cost, lower internal resistance and higher charge/discharge rates.īy comparison, Gel-filled VRLA has a higher internal resistance, which makes it less suitable for high-rate discharging common with UPS applications. VRLA batteries are sealed inside a case which has a valve that vents to release gas if internal pressure gets too much, hence the term “valve regulated”.īecause they are sealed, they can be mounted either vertically or horizontally, so are suitable for use within battery compartments, rackmount trays or external cabinets. In addition, they don’t need any direct maintenance such as being regularly topped up with water. Lead-Acid batteries come in two different types:Īlso known as Sealed Lead-Acid (SLA), this is the most common type found in modern UPS systems. They typically come with a 5 or 10-year design life and are best stored in a dry, climate-controlled room at a temperature of 20-25☌. This cost-effectiveness is combined with other performance qualities such as low internal impedance and high tolerance. Lead-Acid batteries have a proven track record for reliability when used in an uninterruptible power supply system. In large power applications, where weight isn’t the overriding concern, they provide the most economical choice. There are three main types of batteries used in uninterruptible power supplies: Nickel-Cadmium, Lead-Acid, and Lithium-Ion. There isn’t a single “best” UPS battery technology – the choice should be made on a case-by-case basis. Simply select the area of interest to view the full list of relevant products. Use the areas option to go direct to the products that best suit your specific needs for power, backup time, and standards.Search products by areas of application. ![]()
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