It was beeping every 15 seconds or so. I pulled unit off ceiling and checked batteries. Reinstalled. No more beeping. Do I need to replace batteries?

The unit probably needs to be replaced

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Try changing batteries and hit reset button?

How old is it? It may be telling you that it's no longer reliable and must be replaced.

Time to remove that battery; discard the unit; and replace it.

IT might be testing ok, but you need to load test it. It could be the charging circuit but in most cases the battery will show a surface charge that is ok for a short period of time.

Human hearing is not really all that great, especially directionally. Look for the sound to be coming from some other place and bouncing. Check for plug-in CO detectors as they are often the culprit. Try using tape to muffle the sound ports until you find the correct device. Good luck!

This could be several things, fortunately the device should actually be helping you to diagnose the issue. There are different beeps for different issues. They are as follows:

1 Beep Every 5 Seconds = Power Outage\Loose Plug Connection\Tripped Circuit Breaker\Power Cord Damage or Failure

2 Beeps Every 5 Seconds = Low Battery Alarm

3 Beeps Every 5 Seconds = Battery Needs Charging\Service\Replacement

3 Beeps Every 5 Minutes = The Battery is discharged and battery power is unavailable (If this continues battery replacement may be necessary)

1 Beep Ever 1/2 Second = Power Requirements exceed the UPS Capacity (remove some equipment to lighten the load on the unit)

Continuous Beep = Short Circuit / Input Voltage out of Range / UPS Fault (Likely replacement of entire unit)

That should help diagnose the actual issue. If it turns out the battery needs to be replaced they can be found online for around $20. A simple google search for Powerware 3110 Battery should return what you're after. Good luck!

They have a timer which means that they chirp after 7 years. You need new ones. 7 years is how long they think they last.

Hello my friend,
There is no way to have 15 beeps error especially short ones so
First try to count the beeps and if are long or short

You may have a bad memory stick or your os may need to be reinstalled.

Try removing battery, press and hold power button for 5 seconds and then put back in and turn on and see if it works then.