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Either slot can be chosen to take priority (the first Battery Pack placed into either slot is charged first) so that the Wireless Telephone is always ready for use. Full charging is accomplished in approximately two hours for each battery. The Dual Battery Charger will only charge Nickel Metal Hydride (NiMH) Battery Packs used by the 3410 and 3606 Wireless Telephones. This charger will not charge Nickel-Cadmium (NiCd) Battery Packs. Power Supply Four different models of the power supply for the