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The charger is designed to use standard household 120 volt 60 Hz power.The charger is designed to use standard household 120 volt 60 Hz power. After normal usage, your power pack should be fully charged in 3 to 6 hours. If the power pack is run-down completely, it may take up to 6 hours to become fully charged.The charger and battery pack can be left connected with the red light glowing indefinitely. The charger will keepthe battery pack fresh and fully charged.NOTE: A battery pack will slowly lose its charge when kept out of the charger. If the battery pack has not beenkept on maintenance charge, it may need to be recharged before use. A battery pack may also slowlylose its charge if left in a charger that is not plugged into an appropriate AC source.