Denso BHT-500B User Manual page 33

6.
The BHT indicator LED will change to green
when charging is complete.
Charging takes approximately 3 hours.
 Point 

Charging takes approximately 4 hours when using the CU-521 with power supplied via the

USB port.
An only slightly discharged battery cartridge should take this time to become fully charged.

The indicator LED flashing in red indicates the following causes. The proper action stated

below must be taken.
・Abnormal temperature of the battery cartridge is detected.
・Charge the battery cartridge under the proper temperature (0℃~40℃)
・Avoid places where there are objects generating heat nearby or exposed to direct sunlight.
・Terminate charging and replace the battery cartridge if there are no objects generating heat
nearby.
・The charge terminals contact failure
・Wipe any dirt or dust from the charge terminals as described in "6.3 Daily Maintenance".
・Charging is not completed even after the specified time has elapsed.
・Terminate charging and use a dedicated AC adapter to charge the battery cartridge if the
battery cartridge is charging through an unpowered USB.
・The battery cartridge is broken or the battery life has ended.
・Replace the battery cartridge.
Barcode Handy Terminal
Green LED ON
17