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20
• The BHT integrates a 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 at least 48 hours after that loading. This is for charging the
memory backup source integrated in the BHT.
• For handling notes to be observed at the time of battery replacement, refer
to the "Battery Replacement Notes" on page 20.
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