When you insert a battery for charging, which light(s) combination do you see?. There should be red,green and yellow and different individual lights or combinations of lights mean different things. If only the red light goes on, chances are the batteries are to cold to charge. They will not charge below 32F so if your charger is in the garage, take the batteries in the house until they are room temp then try again. If you still have a problem and the unit or batteries are are less than 2 yrs old they should be be under warranty.
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