Denso BHT-300B User Manual page 31

• The BHT has an integrated rechargeable backup power source which backs up the memory and
calendar clock in the BHT when no battery cartridge is loaded or the voltage level of the battery
cartridge drops below the specified level. The backup power source is automatically charged by the
battery cartridge.
When you first load the battery cartridge after purchase or you load it after leaving the BHT unused
for a long time, do not remove the battery cartridge for 10 minutes or more after that loading. This is
for charging the memory backup source integrated in the BHT.
• If you leave the BHT without a battery cartridge loaded 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.
• If you will not be using the BHT for a long time, follow the instructions given in Section 2.3.5,
"Battery Replacement Notes."
• Avoid storing the rechargeable battery cartridge in a hot place. The battery capacity may be
decreased.
• Do not touch the charge terminals of the battery cartridge or stain them. Doing so could result in a
BHT failure or cartridge charging failure. It is recommended that you wipe those battery cartridge
terminals and the BHT's charge terminals with a dry, soft cloth periodically.
Checking the Battery Voltage Level
Pressing the ENT key while holding down the SF key displays the current voltage level of the power
source (battery cartridge) as a bar indicator. (Releasing those keys erases the indication.)
For details, refer to Section 2.3.4, "Displaying the Battery Voltage Level and System Status."
• Avoid dropping the battery cartridge or letting it undergo any
shock or impact.
Doing so could cause the batteries to break, generate heat,
rupture or burn.
• Never charge the battery cartridge where any inflammable
gases may be emitted; doing so could cause fire.
• Do not use batteries or power sources other than the specified
ones; doing so could generate heat or cause malfunction.
Chapter 2 Getting Started the BHT and System Mode
17