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Whenever recharging a cordless drill or other power tool, always unplug the small black transformers that you plug into a wall outlet when it is charged. These are often used with calculators, any battery-operated device, chargers for tools, some desktop fluorescent lights, computer accessories, etc. Even when the device is not being used, the small transformer still draws some electric current. Just put your hand on it and you can feel that it is warm.