RODE Microphones Stereo VideoMic X - Manual (Page 7)

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Insert the battery with the negative terminal (-) on the bottom as
shown in Diagram 2. The correct battery orientation is also shown
on the inside of the battery cover. If the battery orientation is not
correct you will be unable to close the battery door.
Diagram 2 - Insert 9V battery
Powering the SVMX
Replace the cover by simply pushing the door closed until it locks
into place. The cover will push the battery against its spring
terminal during installation.
Diagram 3 - Push the cover until it locks into place
9V