Smart-UPS SRT 3000 error message (UPS: Battery pack 1 disconnected. 0x01A0)

[BillP]

Hi all,

1 of UPS with management card send email with following message:

Date : 05/11/2018
Time : 06:25:26
Code : 0x01A0

Critical - UPS: Battery pack 1 disconnected.
--------------------------------------------------------

I'm confirm UPS and 3 of battery pack are solid connected,
full set UPS and 3 battery pack installed on Oct 2017
used less than 1 year and the message time 06:25 ,
it is out of office hour , no people inside server room,

UPS model :SRT3000RMXLI
Battery pack model:SRT96RMBP

after i login management card page, captured event log as following :

Network Management Card AOS v6.4.6
Smart-UPS & Matrix-UPS APP v6.4.6
NMC Serial Number: (skipped)

Model: Smart-UPS SRT 3000
UPS Serial Number: (skipped)
Firmware Revision: UPS 05.3 (ID1010)

Date                Time        Name    Contact    Location    System IP
05/11/2018    06:25:43    Device    UPS: Battery pack1 disconnected cleared.    0x01A1
05/11/2018    06:25:26    Device    UPS: Battery pack 1 disconnected.    0x01A0
05/11/2018    06:24:52    Device    UPS: Battery pack2 disconnected cleared.    0x01A1
05/11/2018    06:24:35    Device    UPS: Battery pack 2 disconnected.    0x01A0
04/27/2018    15:28:37    Device    UPS: Self-Test passed.    0x01D2
04/27/2018    15:28:16    Device    UPS: Self-Test started by automatic timer.    0x0137
04/13/2018    15:29:08    Device    UPS: Self-Test passed.    0x01D2
04/13/2018    15:28:47    Device    UPS: Self-Test started by automatic timer.    0x0137
03/30/2018    15:29:39    Device    UPS: Self-Test passed.    0x01D2
03/30/2018    15:29:18    Device    UPS: Self-Test started by automatic timer.    0x0137
03/16/2018    15:30:11    Device    UPS: Self-Test passed.    0x01D2
03/16/2018    15:29:49    Device    UPS: Self-Test started by automatic timer.    0x0137
03/02/2018    15:30:42    Device    UPS: Self-Test passed.    0x01D2
03/02/2018    15:30:20    Device    UPS: Self-Test started by automatic timer.    0x0137
02/16/2018    15:31:13    Device    UPS: Self-Test passed.    0x01D2
02/16/2018    15:30:52    Device    UPS: Self-Test started by automatic timer.    0x0137
02/02/2018    15:31:40    Device    UPS: Self-Test passed.    0x01D2
02/02/2018    15:31:19    Device    UPS: Self-Test started by management device.    0x0137
01/31/2018    20:13:11    Device    UPS: Battery pack2 disconnected cleared.    0x01A1
01/31/2018    20:12:54    Device    UPS: Battery pack 2 disconnected.    0x01A0
01/30/2018    09:57:52    Device    UPS: Self-Test passed.    0x01D2
01/30/2018    09:57:30    Device    UPS: Self-Test started by automatic timer.    0x0137
01/16/2018    09:58:23    Device    UPS: Self-Test passed.    0x01D2
01/16/2018    09:58:02    Device    UPS: Self-Test started by automatic timer.    0x0137
01/02/2018    09:58:55    Device    UPS: Self-Test passed.    0x01D2
01/02/2018    09:58:33    Device    UPS: Self-Test started by automatic timer.    0x0137
12/19/2017    09:59:27    Device    UPS: Self-Test passed.    0x01D2
12/19/2017    09:59:06    Device    UPS: Self-Test started by automatic timer.    0x0137
12/13/2017    03:07:25    Device    UPS: Battery pack2 disconnected cleared.    0x01A1
12/13/2017    03:07:08    Device    UPS: Battery pack 2 disconnected.    0x01A0
12/05/2017    09:59:58    Device    UPS: Self-Test passed.    0x01D2
12/05/2017    09:59:37    Device    UPS: Self-Test started by automatic timer.    0x0137
11/21/2017    10:00:31    Device    UPS: Self-Test passed.    0x01D2
11/21/2017    10:00:10    Device    UPS: Self-Test started by automatic timer.    0x0137
11/07/2017    10:01:04    Device    UPS: Self-Test passed.    0x01D2
11/07/2017    10:00:42    Device    UPS: Self-Test started by automatic timer.    0x0137
--------------------------------------------------------

It seem battery pack 3 no problem, may i know why Battery pack 1 & pack 2 disconnected suddenly ?
Is it possible to avoid disconnect again?

Thank you very much.
SF