Denso BHT-1306BWB User Manual page 27

6.
The BHT indicator LED will change to green when charging is complete.
Charging takes approximately 3 hours to charge the BT-20LB and 2 hours to charge the
 Point 

BT-130LA.
If the power is supplied via the CU-1321 from the device connected to the USB port, charging

takes approximately 7 hours for the BT-20LB and 4 hours for the BT-130LA.
The time required for full-charge may be shortened for the battery of less discharged capacity.

The Indicator LED blinks in red under the conditions described below. You should take

appropriate measures.
・Abnormality detected in the battery cartridge temperature
Be sure to charge the BHT under environmental temperature of 0 to 40°C.
Do not use the battery cartridge in places exposed to excessively high temperatures or to direct
sunlight.
If no particular problem is found in the operating environments, stop charging and replace the
battery cartridge with a new one.
・Loose connection of the terminal
Wipe the dirt off the terminal. See Chapter 6.3 "Daily Maintenance".
・Charging not completed even if the specified charging time elapsed
Retry charging with the specially designed AC adopter if the power is provided via USB
connection from a device that has no supply capacity.
・Battery cartridge broken or its product life expired
Replace the battery cartridge with a new one.
Barcode Handy Terminal
LED green ON
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