ION F-18 User Manual page 21

(6) The red wire is connected to the "+" terminal of the battery. The black
wire is connected to the "-" terminal of the battery. (Note: the
green/yellow wire is grounded for protection purpose.)
(7) Make sure the wires are fasten, install the terminal block cover on the
rear panel of the UPS.
(8) Connect the UPS to the load. Then, turn on the mains switch or
connect the power cord of the UPS to utility power supply, the battery
would start to be charged.
Caution:
A DC breaker must be connected between the UPS and external battery.
Caution:
The output sockets of the UPS system may still be electrically live even if the
power supply system has been disconnected or the Bypass switch is on "OFF"
position.
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