I'm very familiar with replacing batteries in UPS's, and I realize they need changing (depending on the unit and battery, every 2-5 years). Some of the better UPS's will give you a warning (light or beep) when batteries need to be replaced. What I am referring to, when I say the UPS went poof, I mean dead. The UPS has literally died, and won't come back to life, even with a new set of batteries. I've dealt with hundreds of these things over the years, and this is what I've found most of them do (just die), usually always at the worst time, and this is even with the most meticulous battery changing schedule. As part of your maintenance schedule, does anyone just replace them (the whole UPS), every 5 or 6 years? I rarely ever see one of these last as long as an AM or FM transmitter, or a decent piece of audio equipment. I guess what I'm asking is, is there a UPS (in the 1500 VA range) manufacturer, that has proven to be more rugged than all of the rest? I've mainly used APC stuff over the years. Is there anything more dependable out there?