UPS backup issues and wattage increases on ups mode

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Guys I have Back-UPS RS 1500VA .

I changed its both batteries exactly a month ago from today.

Everything was working good but since past a week I'm facing very unusual and weird issues with my apc ups.

Ideally my computer desktop uses or eats just 138watts power as shown in Powerchute tool.

But as soon as electricity goes off and pc starts running on ups mode, the wattage start shooting from 138watts to whopping 181 watts even on idle desktop/ zero usage. And I end up geting just 10mins or so backup.

Again in between when the electricity is back, the wattage comes back to 138watts from 181 watts.

Now why is this behaviour occuring??

Also on 138watts I should get around 50 minutes of backup and on 181watts 35mins but none of that is happening.

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