How do I know if a charger is dual voltage and can be used overseas?
Please refer to the back of the charger. If the charger is dual voltage, the input voltage will state 100-240 volts. Energizer offers several dual voltage chargers. However, Energizer does not recommend using chargers that are designed for US power (120 volts AC at 60 Hz) in foreign countries that have a different power supply. Using overseas voltage adapters can result in permanent damage to the charger or wall plug adapter.