Metered, monitored, and switched PDU models display the total current being drawn by the connected equipment on the screen. If there are two outlet banks, then the display is showing the total aggregate current draw between both banks.
A hot-swappable battery eliminates power-related downtime and ensures maximum power availability. All potential UPS maintenance, including complete power module exchange, can be performed without powering down connected equipment. As long as utility power is on, you may leave the UPS and connected equipment on while replacing a new battery.