Turn off your Homelite cordless mower, remove the switch key and set the key aside. Move your mower to a cool, dry place near a 120-volt 60 hertz electric outlet.
Find the battery meter -- identified by five color-coded LEDs -- on the left back side of the mower. Look for the charger plug-in port to the right of the meter. Push the plug from the battery charger into the port.
Plug the AC plug from the brick charger into the outlet. Wait up to 17 hours for the battery to charge and the green LED on the battery meter to turn on to indicate a full charge.
Unplug the charger from the outlet and mower and then use the mower as needed.