For the last two days, my Uninterruptable Power Supply (UPS) has failed to produce the actual back up. So, I charged it for 24hrs and again checked that when the power failed my PC was automatically shut down. But in the time of power no supply from ups bt .......is my ups is working properly or not else there is direct power. It will cause any harm to my pc. my questions are..... Is the UPS functioning properly or not? If not, then will it harm my pc? If it is functioning, will it regulate direct power to pc without any cause? Is my UPS battery not working? What should I do to make my UPS batteries last for at least a year? I am using FRONTECH UPS 600va (Warranty for both ups and battery is expired) I already changed the battery 8 months previously. Note from editor: Tried to make as much sense of this question as I could. I hope I didn't alter the meaning in any way.