ANSWERS: 1
  • Battery chargers consume various amounts of energy depending on the type of charger. According to a report by EfficientProducts.com, a basic cordless tool charger uses 7 watts of AC power. Battery chargers with "state-of-charge monitoring" or smart-charge systems will fall into idle power mode after completing the charge. Chargers consume about 2 watts of AC power while in idle mode.

    Source:

    EfficientProducts.Com: Battery Chargers and Wattage

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