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indicate the exact point of full charge. The light will stop blinking in less time if the battery pack was not completely discharged.
When you begin the charging process of the battery pack, a steady red light could also mean the battery pack is too hot or too cold.
Fast charging is only possible when the temperature range of the battery pack is between 32˚F (0˚C) and 113˚F (45˚C). When needed, the internal fan of the charger will turn on to aid the charging process and speed.
As soon as the battery pack reaches the correct temperature range, the battery charger will automatically switch to fast charging.
If the red indicator light is “BLINKING”, the battery pack cannot accept a charge.
•Check to make sure the battery pack is inserted into the charger properly.
•Clean the contacts of the charger or battery pack (e. g. by inserting and removing the battery several times) or replace the battery pack, as required.
When the battery pack is fully charged, unplug the charger (unless you're charging another battery pack) and slip the battery pack back into the tool.
BATTERY 
PACK
FIG. 8
RED LIGHT
CHARGER
GREEN LIGHT
CHARGER INDICATORS, SYMBOLS AND MEANING (Model BC660)
If the indicator lights are “OFF”, the charger is not receiving power from power supply outlet.
If the green indicator light is
“ON”, the charger is plugged in but the battery pack is not inserted, or the battery pack is fully charged, or
the battery pack is too hot or cold for fast- charging. The charger will automatically switch
to
If the green indicator light is 
“BLINKING”, the battery pack is being
battery pack is fully charged.