Denso BHT-7000 - Manual (Page 136)

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5.5 Charging the Lithium-ion Battery
Cartridge (using the CU-7001)
You may charge lithium-ion battery cartridges loaded in the BHT-7000.
Service Life of Lithium-ion Battery Cartridge:
Lithium-ion batteries used in the 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 deterio-
ration 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 comes on.
(2) Place the BHT-7000 loaded with a battery cartridge onto the CU-7001.
The BHT-7000 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-7000 off the CU-7001.
The charging time is approx. 4 hours if the "Charge the battery!" message is
displayed on the BHT-7000. The battery cartridge not discharged so much will be
fully recharged in shorter time.
BHT-7000
CU-7001