CyberPower 800 AVR
Hi. I've had one since 2003 no problems. Then suddenly I come home and the power had temp gone out, come back on and the tone is constant. I hit the button, on and off. powers, then off, a couple of beeps. Nothing improved it.
I read online...the back up battery eventually wears out and can be replaced! This will happen will all units, it's normal. No biggie and less expensive than a new unit. I haven't replaced mine yet as this all coincided with a new computer purchase and I was planning on getting at least one more unit anyway, so I've just grabbed a 825 off the shelf. I'll figure out ordering a replacement battery as I have time, and perhaps order a couple of smaller units for some other applications in the house.
One of these units is cheaper than the deductible on insurance, and I've had lighting just going overhead take out 2 tv's and such in different houses, 3 different events totalling thousands. My cyberpower protected the tower and computer I'm using now, but others in the house, router, etc were destroyed. You can't risk getting those hits on your insurance if you can help it. If only I'd had one hooked up to the garage door opener, lol. $61 would have saved me $500.