I got a APC smart UPS ... to have access to the batteries, everything looks fine<BR>so my quesiton is: what "User serviceable Parts" are there besides the battery in a UPS like this?< ...

I have an APC Back UPS CS500 - it is just running one PC, so not overloaded. Just recently it started clicking onto battery when there was no sign of any kind of power flicker. First a click ...

Complementing the effectiveness of the APC Smart UPS range is their use of lithium-ion batteries, which can easily handle a wider range of environmental temperatures when compared to competing UPS ...