I have a smart UPS 2200 that is giving me problems, I suspect that the batteries need to be replaced, but I am not sure. There are no visible problems, ie. no error codes, no error lights etc, but every once in a while, usually if there is a power "event", i.e. not a full blackout, but a spike or a low, the unit will begin to click, lights flash etc, and it will go one for a long time, usually ending with the power going out and everything getting turned off - even though, in fact, the power never actually went out - and none of the non-protected devices even shut down.
Of course my first guess is that the batteries need replacing, but at $350 for a new set, I don't want to get new batteries, only to find out that it is the unit itself...
Question is, what are the usual symptoms for bad batteries? and/or how do I know for sure if that will solve the problem.