Denso GT20Q-SB User Manual page 86

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Charging method
(1) Connect the AC adapter to the battery charger before inserting it into the socket.
Confirm that the battery charger's power LED (green) is illuminated.
(2) Set the scanner on the battery charger.
Charging begins when the scanner indicator LED illuminates in red.
Charging time is approximately 2.5 hours. When battery is fully charged, the indicator LED changes to green.
(3) Remove the scanner from the battery charger and unplug the AC adapter from the socket.
Operation and charging status
Set the scanner on the battery charger.
↓
Charging begins
↓ After approximately 2.5 hours
Charging is complete
Scanner indicator LED
Red light
Red light
Green light
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