Answer: A battery charger/charging cradle charges the spare battery. There are also device chargers/charging cradles available in the market that differ from battery chargers/charging cradles. A device charger/cradle charges the entire device with the battery inside of it. There are some device charging cradles that offer a slot for 1 device and 1 battery in the same cradle. However, not all devices have separate battery chargers/cradles available. For some devices, device cradles can be more commonly found.