Battery not lasting estimated time

[BillP]

Hi,

I have a Back-UPS ES 550 which is in front of a small load (an HP Microserver and a wireless router), and it does not seem to hold any charge. 

I am running CentOS 7 with the apcupsd.service daemon on it, and this reports the battery having a runtime of 8.8 minutes. However when testing this, the runtime is a whole 12 seconds. Thinking this was a flat battery, I replaced it with a new one, but have exactly the same problem (and the old battery has been sent for recycling, so can't get that back). 

I tried to look to see if there was any firmware update available, but the product page  on the APC website for Australia has no firmware / documentation to download. (I can see it on other countries pages, but it won't let me download).

I also tried to use the apctest utility to "Perform battery calibration", but got a message that "I don't know how to run a battery calibration on your UPS or your UPS does not support battery calibration"

Some values from the apcaccess utility:

APC : 001,034,0837
DATE : 2016-05-04 14:18:00 +0800
VERSION : 3.14.12 (29 March 2014) redhat
CABLE : USB Cable
DRIVER : USB UPS Driver
UPSMODE : Stand Alone
MODEL : Back-UPS ES 550G
STATUS : ONLINE
LINEV : 250.0 Volts
LOADPCT : 0.0 Percent
BCHARGE : 100.0 Percent
TIMELEFT : 8.8 Minutes
MBATTCHG : 5 Percent
MINTIMEL : 1 Minutes
MAXTIME : 0 Seconds
FIRMWARE : 870.O3 .I USB FW:O3

I don't if 

A) I have had two dud batteries in a row (the original and the replacement)

B) I have a dud UPS box

C) There is a test / configuration that I need to perform.

Anyone got any suggestions?

Thanks