Energy Intelligence speciality Computer Monitor UPS (CMU13) is an uninterrupted power backup solution for DC monitors 24" - 27".

Time motion studies have proven that having dual monitors can improve your productivity 20-30%. Yes 20-30%. Whether you are answering customer calls, doing CAD design, into video gaming or simply replying to emails - while your work in a presentation - dual screen can not only save time opening/closing/toggling between windows, it can make your thoughts flow more fluidly. Read this analysis on productivity and and article how useful and easy it is to use dual monitors.

But if you have a power cut - while your laptop will run for a few hours on batteries, you may even have an Energy Intelligence UPS for your router and you continue to have your WiFi working, losing that 2nd screen can really cost you in lost productivity and increased errors.
https://energyintelligence.in/collections/specialized-devices/products/cmu13