Denso BHT-100Q - Manual (Page 160)

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5.5 Charging the Rechargeable Bat-
tery Cartridge (using the CU-7001)
You may charge a rechargeable battery cartridge loaded in the BHT.
Service Life of Rechargeable Battery Cartridge:
Lithium-ion batteries used in the rechargeable battery cartridge will gradually
deteriorate during the repeated cycles of charging and discharging due to its
properties, even under normal use. When the battery service period becomes
shortened due to its deterioration even if it has been charged for the specified hours,
replace the battery cartridge with a new one. Generally, it is necessary to replace
the battery cartridge after it has undergone approx. 300 cycles of charging and
discharging operation.
(1) Plug the AC adapter of the CU-7001 into the wall socket.
The POWER LED on the CU-7001 lights in green.
(2) Place the BHT loaded with a battery cartridge onto the CU-7001.
The BHT turns on the indicator LED in red and starts charging. The charging time
is approx. 4 hours.
Upon completion of charging, the indicator LED turns green.
(3) Take the BHT off the CU-7001.
The charging time is approx. 4 hours if the "Charge the battery!" message is
displayed on the BHT. The battery cartridge not discharged so much will be fully
recharged in shorter time.
BHT
CU-7001