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When operating on line, the runtime remaining (calculated by microprocessor) must be AT LEAST two minutes more than the low battery signal warning time.

If the UPS calculates the runtime remaining  as being less than 2 minutes more than the low battery signal time, the battery charge graph LEDs will flash


Option 1: Reset the low battery signal time to a lesser value. Take for example a UPS with 15 minutes of battery runtime at full charge, and with the low battery signal warning time set for 7 minutes. If runtime remaining is 8 minutes or less , then the battery bar graph LEDs will flash in unison. Try setting the low battery signal warning time to a lesser value through the Configuration menu and then the UPS Shutdown Parameters submenu of the monitoring software. Two minutes is usually the lowest setting option available.

Option 2: Reduce the load or replace the battery. UPS batteries are consumable items, as the batteries in your UPS age, they lose their ability to hold a charge and therefore available runtime will decrease over time. Once the runtime remaining is within 2 minutes of the low battery signal warning time, the UPS battery charge LEDs will begin to flash and the monitoring software will report that the “”UPS battery are discharged””, even if the battery is at 100% capacity. In the case of an older unit running with a heavy load, try reducing the attached load. If the unit is an extended run time model, then try adding an additional battery pack. Typical battery life is 3 – 4 years.

Get in touch

For advice about what the best battery for your system is or to enquiry about our battery replacement service, get in touch with our team today with your requirements and we will be happy to help.

Battery Replacement Service

Our engineers can carry out on site UPS battery replacements for all makes and models of uninterruptible power supply during normal office hours, or out of hours with minimal fuss or interruption to your business. Replacement UPS batteries can also be replaced during a maintenance visit or as part of a UPS health check.

Old UPS batteries must be disposed of safely and in accordance with special waste regulations. At Source UPS, we can collect your old UPS batteries for certified disposal and offer a battery removal service for larger UPS systems.

To get a quotation for replacement UPS Batteries or to speak to a member of our team please give us a call on 01252 692559 or email:

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