UPS and more…

So after having a poke around the unit i found out that “On buck” basically means that the incoming voltage from the wall was higher than the output voltage of the unit, so after reading the PDF manual I discovered that I had to set the rear switches to a specific way in order to accommodate the voltage and clear the “On Buck” warning.

Switches are now set at 240V based on the conveniently placed diagram

However upon testing the batteries of the unit and how long it would last I discovered that the “good” batteries were, in fact, no good! I tested them by putting my laptop charger on the UPS and then unplugged it from the mains, within 30 seconds it died and I was confused and assumed that the unit was dodgy. But I thought I should at-lease check the batteries when the unit was under load to check they were outputting the correct voltages!
I pulled the front panel off the UPS and found the battery tray just slides out, handy!

The batteries were stuck to the tray and each-other with double-sided tape

I had to get a Stanley knife to hack away at the double sided tape holding everything together, it was quite a time-consuming task!

Battery 1 was a goner

Battery 2 was not far behind

Battery 3 was surprisingly okay…

So there is a good chance that is the problem, I ordered some replacement batteries off eBay, I know they probably are not the greatest quality batteries but 25$ a pop with free delivery why not…