Contact Us

HomeBlogHow to tell if ups battery needs replacing?

How to tell if ups battery needs replacing?

Old batteries are frequently the weakest component in an Uninterruptible Power Supply (UPS) system. A UPS is crucial for delivering emergency power to maintain your devices during power failures, allowing enough time for a generator to start or for devices to be properly shut down. It also safeguards against surges, brownouts, and other power anomalies.

While UPS systems depend on batteries as their power source, these batteries are susceptible to failure and often need replacement. Knowing when to replace a UPS battery is necessary. This guide will highlight key warning signs to watch for, methods to confirm battery failure and options for replacement. Ready to learn more?


6 Warning Signs of UPS Battery Replacement 


  • Low Battery Alarm


Most UPS systems have a low battery alarm that alerts you, typically through an indicator light or sound. Digital monitoring systems may also send alerts via email or other electronic means.


  • Preventive Maintenance Visits


During annual or semiannual UPS Preventive Maintenance Visits, technicians will check your batteries against OEM specifications using Midtronics readings. Their expertise and the readings will provide insights into the health and longevity of your batteries.


  • Strange Behavior & Symptoms


As batteries approach failure, they may exhibit unusual signs such as repeating alarms, flashing panel lights, or odd terminal displays. These are indicators of a failing UPS battery.


  • Old Age


Manufacturers place a date code on batteries indicating their production date. Generally, UPS batteries last 3-4 years, but this can vary with system usage and load. As batteries approach this age, consider replacement.


  • Capacity Shortfall


When a battery can no longer hold at least 80% of its rated capacity in ampere-hours, it's likely time for a replacement. At this point, the aging process accelerates, quickly ending the battery's useful life.


  • Early Discharge


Noticing your UPS batteries charging slower and discharging quicker than usual is a clear sign of nearing the end of the battery's lifespan.


To confirm the need for UPS battery replacement after noting warning signs, follow these steps:


  • Inspect the Batteries


Check the physical condition of the battery. Signs like broken terminals, bulges or cracks in the casing, excessive leaking, or discoloration are strong indicators of damage or failure. These could be due to internal shorts, overcharging, or poor maintenance. If the battery appears intact, proceed to the next step.


  • Take a Voltage Reading


Using a voltage reader, measure the battery's output and compare it to its rated voltage. A significant drop in voltage while charging suggests issues such as a short circuit or a dead cell. Sulfated batteries often fail to reach full charge and discharge rapidly. Any of these conditions usually warrant a battery replacement.



Battery Replacement Options 


When it's time to replace your UPS batteries, typically, similar VRLA (Valve-Regulated Lead-Acid) models are used. If you're seeking extended runtime or additional backup, consider discussing upgraded options with your service provider. Sometimes, larger amp-hour batteries can be accommodated within your existing cabinet to increase runtime. Alternatively, if space permits, adding a cabinet can provide redundancy.


Regularly replacing UPS batteries ensures continued reliability. This process might include installing new batteries, connecting hardware, and setting up battery monitoring systems, all by OEM specifications. Scheduling replacements during off-peak hours can minimize disruption.


How to Maintain a UPS Battery?


To ensure optimal performance, it's recommended to test your UPS batteries semiannually. For smaller units, you can conduct a simple test by unplugging the connected devices and observing if the UPS activates correctly.


Larger UPS units, with a more extensive battery bank, necessitate specialized equipment for a load test. It's a good idea to inquire with your local ACE Battery  Regular testing helps maintain the reliability and efficiency of your UPS system.

Previous article
Next article
Contact Us for Your Energy Solution!

Our expert will reach you out if you have any questions!