Replacing the Timer Battery in the Kiosk Required Tools Screwdriver Wrench or socket tool (for loosening the nuts, size depends on model) 4 × AA batteries (new) 1. Disconnect power Unplug the kiosk from the power outlet to ensure it is completely powered off. 2. Remove the cover Use a wrench or socket tool to loosen and remove the 4 nuts . Remove the cover carefully. 3. Loosen the timer (if required) If the timer is mounted tightly: Slightly loosen the 2 nuts on the left and right side of the timer using the wrench or socket tool. Do not remove them completely. 4. Remove the timer from the DIN rail On the bottom side of the timer, locate the red release knob / lever . Use a screwdriver to push it downward . Pull the timer forward to remove it from the DIN rail. 5. Replace the batteries On the back side of the timer: Replace the 4 AA batteries . Make sure the polarity (+ / –) is correct. 6. Reinstall the timer Mount the timer back onto the DIN rail and press it firmly into place. Tighten the previously loosened nuts using the wrench or socket tool. 7. Check connections Before reinstalling the cover : Check all connectors and terminals . If any connectors are loose, gently tighten them with a screwdriver. 8. Reinstall the cover Put the cover back on and secure it with the 4 nuts . 9. Power on and set mode Plug the kiosk back into the power outlet. Set the timer switch from AUTO / MANU to ON .