check_apc
This script will check if the UPS is on batteries (and display the percent of battery which is left) or on cable power.
command definition
define command{ command_name check_apc command_line $USER1$/check_apc_on_battery $HOSTADDRESS$ }
service definition
define service{
use                            default-critical
host_name                      apc
service_description            UPS Status
check_command                  check_apc! $HOSTADDRESS$
max_check_attempts             1
notification_interval          5
}