Denso BHT-604Q User Manual page 25

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) to lock the cover in position.
4.
Connect the dedicated AC adapter to the DC input
connector on the charger and plug the adapter
into the wall socket.
2D Code Handy Terminal
The charger Power LED
(green) turns ON.
Terminal
13