What should I do if both yellow and green LEDs come on during charging?
This indicates a deeply discharged or defective battery pack. Allow the battery pack to remain in the charger for 15 to 30 minutes; when it reaches normal voltage, the red LED should come on. If the red LED does not come on after 30 minutes, the battery pack is defective and should be replaced. (Page 9)
From the official Craftsman 973.113450 Cordless Drill/Driver manual, page 9
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