Mujhy desktop computer k liye UPS chahiye. I want to prevent computer rebooting when the electricity goes down and for this purpose I need a UPS for my computer. Back up time UPS ki waja se increase hota hy ya battery ki waja se computer ka back up time increase hota hy? Mujhy aik computer k liye UPS chahiye aur mein chahta hoon k load shedding k dooran mujhy 1 ya 2 hour ka back up time mil Jaye. Aik hour k back up k liye mujhy UPS aur battery k charges ko include ker k total kitna kharcha kerna pary ga? 2 hours k back up time k liye mujhy kitna watts ka ups Lena hoga aur us per mujhy total kitna kharcha kerna hoga ( including the price of UPS and battery? Mujhy second hand UPS ya battery nahi chahiye.