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Battery Charger BT-C2000
capacity C and D cells is very low. In this case contact resistance is much greater than the internal
resistance of the cell. The added contact resistance of the adapter contacts renders the
measurement invalid.
6.2 CURRENT Selection
After the Mode is selected press the CURRENT button to toggle between available charge/
discharge current selections. Default charge current is 400 mA. Available selections are 200 mA,
400 mA, 600 mA, 1000 mA. If batteries are inserted in only slots 1 and 4 the charging current can
be further selected to 1200 mA or 1400 mA for channels 1 or 4. If charge current is selected to
1200 mA or 1400 mA for channels 1 or 4 and batteries are then inserted into slots 2 and 3, the
charge current in slots 1 or 4 will be reduced to 1000 mA maximum.
Discharge current is automatically selected at one half of the charge current. Maximum discharge
current is 500 mA. If battery slots 2 or 3 are not occupied then 600 or 700 mA discharge current
may be programmed for discharge current. However actual discharge current may be lower
depending on battery internal resistance.
6.3 DISPLAY Selection
Press the DISPLAY button to toggle among the display of Voltage, Current, Capacity and Time.
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Charge/Discharge Current: the instantaneous current is displayed.
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Time Elapsed: The charging/discharging time of the last cycle is displayed.
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Accumulated Capacity: The accumulated charge or discharge capacity is displayed in mAh or Ah.
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Voltage: The instantaneous battery voltage is displayed.
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Quick Test: displays the measured internal battery resistance in milliohms.
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Full: Battery full charge detected. After the rechargeable battery is fully charged maintenance
charging will be started automatically. Maintenance charging prevents the rechargeable
batteries from being overcharged when left in the charger and compensates for self-discharging
of the batteries. FULL will flash in the display when full charge is detected.
6.4 SLOT Selection
Pressing the SLOT button will start the slot selection process in the sequence: Slot 1, Slot 2, Slot 3,
Slot 4, All 4 Slots, and Exit. Flashing display segment indicates slot selection. If all four display slot
segments are flashing, this indicates all four slots selected. Mode and Current selection will then
be for the selected slots.
7. Temperature Monitoring
Battery temperature and charger internal temperature are monitored during operation. Battery
temperature of 60 degrees Celsius (140 degrees F) or controller board temperature of 77 degrees
Celsius (171 degrees F) will cause operation to be suspended. Four batteries are temperature
monitored individually. Two controller board sensors monitor charger internal temperature. If
controller board over temperature is detected, current will be suspended for the corresponding
two battery slots. If battery over temperature is detected only the affected channel current will be
suspended accordingly. The charging/discharging process will only resume once the temperature
of the batteries drops below 40 degrees Celsius (104 degrees F) or charger controller board
temperature drops below 50 degrees Celsius (122 degrees F) as appropriate.
