Product(WX812L) NITRO 20V POWER SHARE 4½" CORDLESS ANGLE GRINDER WITH BRUSHLESS MOTORContinuous flashing light on the battery charger indicator
(WX812L) NITRO 20V POWER SHARE 4½" CORDLESS ANGLE GRINDER WITH BRUSHLESS MOTOR

Continuous flashing light on the battery charger indicator

Try this solution

Reinsert the battery

Try reinserting the battery into the charger.

Possible Cause:
The battery may not be properly seated.