Denso BHT-604BW User Manual page 29

Charging with the communication unit (CU-601, CU-611 and CU-621)
or battery charger (CH-651 and CH-654)
1.
Slide the battery cover lock (1) in the direction
indicated by the arrow and remove the battery cover
(2).
2.
Check the battery cartridge terminals and indication
on the BHT unit, and then insert the cartridge in the
direction indicated by the arrow.
 Point 
Do not use battery cartridges other than
those specified by DENSO WAVE.
3.
Insert the battery cover tab (1), and then close the
battery cover (2) The battery cover is now locked in
position.
4.
Connect the dedicated AC adapter to the DC input
connector on the charger and plug the adapter into
the wall socket.
The charger Power LED (green) turns ON.
Barcode Handy Terminal
Terminal
15