Rob recently replaced his laser printer. But since he connected it, he gets a beep on his backup power supply. Didn't happen until he plugged in the printer, and when he turns it off, it stops beeping. Leo suspects that the battery may be wearing out and it's pulling too much of a load. As UPS wear, the capacity may go down, and a little extra in wattage can make the UPS choke. Plus, Rob may need to plug it into a different circuit, not a different plug. He might need the next model up.