That is what I thought - but it is on a UPS. The phone system, and UPS, are less than 2 years old. We have an APC Smart-UPS XL1500VA with a SUM48RMXLBP2U add on battery. I would think that would be enough to protect and power a MICS, 7 0X16 and 4 0X8A station mods, CP150, SMDR, RAD, and music...