The cradle features a spare battery charger - great to have if you have multiple batteries. If you want to use the cradle's spare battery charger, you also need to connect the bundled AC adapter. The AC adapter does not charge your device, it only provides power to the battery slot.

*Note: Phones with an EXTENDED battery/battery door may need to remove them from the phone to charge.The battery may be removed from the phone and placed in the spare battery charger. Spare battery charger may not work with all extended batteries.