Fyi,
You can get a external battery pack enclosure to increase you battery time.
However it looks like the price is $160.00.
Just replacement batteries for the external cabinet are $166.00
But beware that the battery's and UPS are only warranted for like 3 years.
So that means buy a new UPS and or external pack every three years.

Be happy your ups lasted this long.

But to that fact I have had success with batteries Plus being a lot cheaper. Only if the issue was in fact the batteries.
Then you waste your money buying new batteries to find that the ups itself is failing.
So for consumer grade UPS units I always suggest just buy a new one.

Last edited by Ruben; 07/17/2020 3:43 PM. Reason: added comment

There is no such thing as stupid questions , Just stupid answers.