My 1998 Uninterruotible Power System Became a nuissance - every 15 mins or so it beeps. The manual says that those double beeps mean the battery needs replacement. I'd rather replace the USB than its acid-lead 15 lbs battery, but my question is: do I need UPS at all? I can use $5 surge protector (in case the power supply in my PC doesn't have a fuse); I live in New York City, visible power interruptions are exceedingly rare and what will happen if one occurs when I am in the middle of typing this question? Not a major catastrophe...