Denso BHT-100Q - Manual (Page 46)

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(2) When turning the BHT on after storage with no battery cartridge loaded:
Even after removal of the battery cartridge, the calendar clock will work with the
backup power source for a while.
If the calendar clock backup has stopped, loading the battery cartridge and
turning the BHT on will display the following message, prompting you to set the
current date and time.
Set the calendar clock according to the procedure given in Subsection 2.3.2.
(The indication "00/01/01 00:00" will vary depending upon the calendar clock
state.)
• The rechargeable battery cartridge can be recharged hundreds of times, but it will
eventually wear out. If the run time is noticeably shorter than normal, replace the
battery cartridge with a new one.
• Use only DENSO WAVE-authorized battery cartridges and chargers.
• Never dispose of batteries into a fire.
• When disposing of battery cartridges, cover their terminal pins with vinyl tape to
prevent short-circuit.
• Batteries should be recycled properly. Do not throw them in the trash.