
BATTERY PACK AND CHARGER INFORMATION
change in voltage) sensing to determine when the battery is nearly fully charged. This type of sensing prolongs battery pack life because overcharging is minimized.
Operation is in the fast charge mode until the battery pack is approximately 95% charged. Charging is then in the slow mode until the pack is removed from the charger. With these battery packs, the fast rate is approximately 1400 mA and the slow rate is approximately 70 mA.
When the battery is inserted in the charger, the red charge indicator turns on continuously to indicate that charging in the fast mode is occurring. If this indi- cator flashes at a slow rate when the pack is inserted, it indicates that charging is occurring at the slow rate because battery parameters are not within the required range. The battery temperature must be within +50 to +104° F (+10 to +40° C) and the battery voltage must be above 6 volts for rapid charging to occur. When these parameters reach the normal range, the charger automatically switches to the fast rate.
The primary method used by these chargers to detect a fully charged battery is to sense the point at which the battery temperature begins increasing at a faster rate (ΔT/Δt). This normally provides the first indication that the battery is fully charged. If this method does not indicate a charged battery, the charger also detects a negative change in battery voltage (minus ΔV) which also indicates a fully charged battery.
To provide
When the battery is fully charged, the charge indicator begins flashing at a rapid rate and the slow charge rate is selected. The charger then remains in this mode until the battery is removed from the charger.
November 1999 |
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