small rant against APC UPS

just small test run time of my UPS
it's APC SUA1000XLI
http://ift.tt/1H2SQRX

test 1 battery and 2 batteries
load with hair dryer, stable at 338 watt
got 15,7 minutes for 1 battery
and 28,4 minutes for 2 batteries

the web chart
1 battery = 44,3 minutes
2 batteries = 190 minutes


i don't know how APC got the 190 minutes :crazy:
but i'm really disappointed with my 28,4 minutes result vs APC 190 minutes :wall:

i will buy new battery later and update again later..

small rant against APC UPS