Weird behavior on SMT1000IC - "Battery Discharged", "Battery Charge in Range" all the time.

[gdarko]

My unit uses the original APC RBC6 (2xGP12120 OEM) batteries and it is one year old, but was not used for several months. Since I started using actively few months ago, I am noticing those messages in PowerChute event log. It happens all the time with pauses, I believe this happens on load higher than 25%.

Month ago I did calibration, it shows me 45 minutes runtime. Self test passes. Once I stop the electricity in the house the UPS starts on battery just fine, show 40 minutes. Battery voltage according to PowerChute is from 26 to 27 VDC mostly.

What could be wrong or is this normal? I read APC Manual but couldn't nothing about this little mystery. I am open to replace the batteries but is that really needed?

Any help would be greatly appreciated.

8/26/22	14:12:49	Battery Discharged
8/26/22	14:12:46	Battery Charge in Range
8/26/22	14:11:44	Battery Discharged
8/26/22	14:11:42	Battery Charge in Range
8/26/22	14:11:39	Battery Discharged
8/26/22	14:11:35	Battery Charge in Range
8/26/22	14:10:12	Battery Discharged
8/26/22	14:10:07	Battery Charge in Range
8/26/22	14:10:02	Battery Discharged
8/26/22	14:10:00	Battery Charge in Range
8/26/22	14:09:42	Battery Discharged
8/26/22	14:09:40	Battery Charge in Range
8/26/22	14:09:28	Battery Discharged
8/26/22	14:09:20	Battery Charge in Range
8/26/22	14:09:08	Battery Discharged
8/26/22	14:09:06	Battery Charge in Range
8/26/22	14:09:02	Battery Discharged
8/26/22	14:08:53	Battery Charge in Range
8/26/22	14:08:39	User Logged On
8/26/22	14:08:32	Battery Discharged
8/26/22	14:08:12	Battery Charge in Range
8/26/22	14:05:31	Battery Discharged
8/26/22	14:05:28	Battery Charge in Range
8/26/22	14:05:24	Battery Discharged
8/26/22	14:05:16	Battery Charge in Range
8/26/22	14:04:48	Battery Discharged
8/26/22	14:04:46	Battery Charge in Range
8/26/22	14:04:30	Battery Discharged
8/26/22	14:04:21	Battery Charge in Range
8/26/22	14:04:19	Battery Discharged
8/26/22	14:04:04	Battery Charge in Range
8/26/22	14:03:54	Battery Discharged
8/26/22	14:03:50	Battery Charge in Range
8/26/22	14:03:32	Battery Discharged
8/26/22	14:03:30	Battery Charge in Range
8/26/22	14:02:58	Battery Discharged
8/26/22	14:02:31	Battery Charge in Range
8/26/22	14:02:24	Battery Discharged
8/26/22	14:02:18	Battery Charge in Range
8/26/22	14:02:16	Battery Discharged
8/26/22	14:02:14	Battery Charge in Range
8/26/22	14:02:06	Battery Discharged
8/26/22	14:02:04	Battery Charge in Range
8/26/22	14:02:02	Battery Discharged
8/26/22	14:01:58	Battery Charge in Range
8/26/22	14:01:22	Battery Discharged
8/26/22	14:01:02	Battery Charge in Range
8/26/22	14:00:48	Battery Discharged
8/26/22	14:00:46	Battery Charge in Range
8/26/22	14:00:40	Battery Discharged
8/26/22	14:00:38	Battery Charge in Range
8/26/22	14:00:34	Battery Discharged
8/26/22	14:00:30	Battery Charge in Range
8/26/22	14:00:10	Battery Discharged
8/26/22	14:00:00	Battery Charge in Range
8/26/22	13:51:26	Battery Discharged
8/26/22	13:51:18	Battery Charge in Range
8/26/22	13:50:52	Battery Discharged
8/26/22	13:50:26	Battery Charge in Range
8/26/22	13:50:24	Battery Discharged
8/26/22	13:50:16	Battery Charge in Range
8/26/22	13:50:10	Battery Discharged
8/26/22	13:50:07	Battery Charge in Range
8/26/22	13:50:00	Battery Discharged
8/26/22	13:49:58	Battery Charge in Range
8/26/22	13:48:52	Battery Discharged
8/26/22	13:48:50	Battery Charge in Range
8/26/22	13:45:06	Battery Discharged
8/26/22	13:45:03	Battery Charge in Range
8/26/22	13:45:00	Battery Discharged
8/26/22	13:44:58	Battery Charge in Range
8/26/22	13:44:52	Battery Discharged
8/26/22	13:44:48	Battery Charge in Range
8/26/22	13:44:38	Battery Discharged
8/26/22	13:44:36	Battery Charge in Range
8/26/22	13:44:30	Battery Discharged
8/26/22	13:41:52	Battery Charge in Range
8/26/22	13:41:44	Battery Discharged
8/26/22	13:41:36	Battery Charge in Range
8/26/22	13:41:24	Battery Discharged

[JonPro]

Hi @gdarko 

Thank you for reaching out to the SE Community, my name is Jon and I will assist you with this query.  May I please know the serial number of your UPS and are the batteries the original ones?

You mentioned that it wasn't used for a couple of months, how long was that?  Though it wasn't used, was it plugged in or you've unplugged it?  The reason I asked is that proper care should be done to batteries that will be stored.  Please see the articles below for your perusal.

Battery Discharge During Storage 

Battery Damage When Battery Is Left Discharged 

What is the expected life of my APC UPS VRLA battery? 

Why does a battery weaken when not in use?