Does anybody know of a UPS that has a 'spare' battery so that when I swap the main battery out if it needs replacing I don't have to bring the server down in the process. What I am looking for is the following scenario:
UPS battery needs replacing
there's a spare battery on the unit which I turn on so that the UPS stays 'on'
I then can change the battery without bringing down the server
when I'm done I switch back to the 'real' battery I've just swapped in and the spare battery gets charged up for future swaps
I realize there are UPS's with redundant batteries but I'm hoping for something less costly than those. Based on what I have seen on the cost of those units for not much more I can have the server/s plugged into a power bar which in turn is connected to two UPS both plugged into separate power outlets.