Shorten the Lifetime of VRLA Battery

In fact, VRLA battery is always used in the ups system and its lifetime is defined as the period of time in which a battery is capable of being recharged and retains the charge applied. Once the battery is no longer capable of being recharged or cannot retain its charge properly, its lifetime reaches its end and it becomes a 'used battery' for the application it was designed for.

The lifetime of a VRLA battery is very dependent on its rate, conditions and kind of use. It is estimated to be between 1 up to 5 years. Depending upon manufacturer & product, expected life of all lead acid batteries will be cut in half for every 10-15 degree (F) rise in temperature over recommendation (usually 77 degrees F). For VRLA types, impact of excessive heat is most severe because it will lead to dry-out and open circuit failure, and in worst case scenarios in combination with older chargers, can contribute to thermal runaway, with explosive results.

Most UPS systems cycle batteries not just during outages, but also for changes in load levels as well as large dips in input voltage. In fact, many battery companies now limit warranties based upon the number & duration of these discharge cycles. Charge voltage, current and duration also has impact on VRLA reliability. Older or defective chargers can overcharge or add ripple current leading to heat buildup and premature failure.

Clearly, it is good idea to keep temperature controlled to 77 degrees F or less, and this is easily and regularly done. So temperature also has an important influence on the VRLA battery. Of course, if you don't take care of these batteries, it also will shorten its life. All the factors could reduce the lifetime of VRLA battery.

If you want the VRLA battery for longer time use, you should check and maintain it on a regular basis. Don't forget to store it in a dry place with good ventilation. Never over charge it. Don't let it deep discharge. So today it's all. See you next time.