Location: Pakistan, Quetta.
Thank you very much Giselle the links provided me the information I was searching for, I understand my requirements now and what to look for when buying a UPS.
Thank you Chris it seems after buying a UPS. I can buy the battery with more capacity. Since buying the most expensive one is out of my reach I choose to upgrade the Battery only.
Jim I like how laptops are charged and everything but I am comfortable with Desktops
Although I am jealous of that charging ability and being able to work even if there is no electricity for 2-3 hours.
I am going to conduct a survey of all the Internet cafe around my neighborhood and find out the monthly cost of their generators.
Thank you for all the help ^__^.