Entel HT644 GMDSS User Manual page 8

Battery Care / Information
Attaching / Removing the Battery Pack
To attach, locate the pegs on the bottom of the
battery into the slots on the radio and press the
top of the battery against the radio. Secure
battery by tightening the screw clockwise by
hand. (Do not over tighten)
2
To remove, unscrew the locking screw
anticlockwise & pull the battery away from the
top of the radio.
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2