I "Hot Swapped" 3 APC Smart UPS 1500 batteries at three different power plants here in southern California. These UPS systems are used to power the CAISO RIG (California Independent System Operator Remote Intelligent Gateway). It is a critical system for our electric power grid in the State of California.It took me less than ten minutes to perform this task! This is the first time I ever had to change a battery in a UPS system. The tools I used were just one Phillips screw driver
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