SUA1500 "The battery power is too low to support the load..."

[Anonymous user]

All 5 battery lights on the front of my SUA1500 are flashing. A new set of batteries did not remedy the problem. Logging into the web GUI for the APC9630 shows a critical error: "The battery power is too low to support the load; if power fails, the UPS will be shut down immediately." The load on the UPS is only ever 1 or 2 out of 5 on the front bar graph and the battery voltage for the new and old packs measure 27V and the runtime is 0 minutes.

What is the issue here?

[BillP]

Hello..start here and let me know if you have any questions -> Why are the battery charge LEDs flashing on a Smart-UPS? | FAQs | Schneider Electric US

[Anonymous user]

You suggestion sort of worked but I had to do it in two parts. A load of over 10% caused the calibration test to fail. I ran the calibration test for an hour using only a 60 watt light bulb. Stopped the test, reset the UPS and then restarted it with a 32% ± 2% load. It finished calibrating fine after that.

Any idea how it got so far out of whack? Did I unnecessarily replace the batteries? Ever heard of this happening before? Is there a manual firmware/calibration data reset to factory defaults?

Thanks.

[BillP]

How old were the original batteries? Had you had an extended power outage before the events about battery power being too low came through?

[Anonymous user]

Batteries were 3 years old, almost never supporting a load except for the bi-monthly scheduled test. Yes, there was an extended power outage a week or so before the warning.

[BillP · Accepted solution]

Hmm, OK. That sounds normal to me that it was likely time for new batteries anyway. I don't think it was a waste.