Denso BHT-604Q User Manual page 29

Mishandling of the charger may result in charger overheating, smoke generation, blowout or
combustion. Please read the following items prior to use.
Terminate charging if not completed even after the specified time has elapsed.
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 Note 
The BHT is equipped with a back-up battery used to back-up the internal memory and calendar

clock when the battery cartridge is removed or the battery voltage falls below the stipulated level.
It is therefore necessary to charge the internal back-up battery when using the BHT for the first
time or when left unused for long periods of time.
The back-up battery is charged automatically when a fully-charged battery cartridge is inserted.
To ensure that the back-up battery is fully charged, do not remove the battery cartridge for at least
10 minutes when using the BHT for the first time or when using after long periods of time.
If you leave the BHT without a battery cartridge inserted for a long time, the memory contents will

no longer be backed up so that the message "Contact your administrator. Note the error number.
(XXXX)" or "Set the current date and time." may appear on the LCD.
Refer to "Chapter 6 Maintenance" – "6.2 Using the BHT after Long Periods" for details of handling

the BHT after long periods of time.
Avoid storing the battery cartridge in high-temperature locations. The battery capacity may

decrease.
Do not touch the BHT, battery, or charger terminals by hand or stain them. Doing so may result in

a BHT operation defect or battery cartridge charging failure. It is recommended that dirt on the
battery cartridge terminals or BHT battery terminals be periodically wiped with a soft, dry cloth.
2D Code Handy Terminal
17