Midtronics MDX-300 Series, Instruction Manual, Page: 17 / 21

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MDX-300 Series
Replacing the 9-Volt Battery
The tester uses a 9-volt battery (alkaline recommended) that allows test -
ing of 12-volt batteries discharged down to 1 volt in addition to supply-
ing power while the option menu is active. The tester can test down to
5.5 volts when the internal 9-volt battery is not functioning.
NOTE: The tester retains setup information while you change the 9-volt
battery.
1. Turn the tester face down.
2. Remove the screw securing the battery compartment cover using a
small Phillips screwdriver.
3. Slide the door off as shown in the illustration.
4. Remove the discharged battery.
5. Insert a 9-volt battery as shown below, making sure the positive and
negative terminals are positioned correctly.
6. Reposition the cover and tighten the screw.
slide the door in this direction