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Cost and regularity of changing internal batteries in your UPS System is probably one of the most common questions when it comes to maintaining a typical Uninterruptible Power Supply.
In short, the life of UPS internal batteries is almost impossible to predict. It’s common to assume that the batteries will last between 2-5 years given standard operating conditions. There are many factors that can affect the useful life, such as ambient temperature, battery quality, discharge/recharge frequency, humidity, etc.
As a rule of thumb, many manufacturers recommend to have the internal batteries replaced every 2 years to achieve maximum system reliability. That’s is probably why you’ll find that Manufacturer’s Warranty on UPS internal batteries is typically no more than 2 years.
Normally a UPS would perform a periodic self-test to verify that the batteries are still in good order. If it detects that batteries are faulty, the UPS will display a fault signal thereby letting the user know that the batteries need replacement. Consequently, a lot of users choose to wait till the batteries fail before replacing them. Although this might seem as the most cost effective solution, there are few issues at play:
Overwhelming majority of UPS Systems use the sealed lead-acid SLA (also known as VRLA or valve-regulated lead-acid) type of internal batteries. It is currently the most reliable, safe and cost-effective type of battery, hence why it’s so widely used in UPS Systems.
Also, with some UPS models the process of replacing batteries is easier than with others. Please refer to the UPS user manual for more details.
In order to avoid injuries, we always recommend to have the internal batteries replaced by properly trained and adequately qualified personnel.