The Universal Smart Charger is a necessary upgrade from the standard wall charger; having the ability to charge from 7.2 to 12 volt NICD and NIMH battery packs. This charger is designed to automatically detect when your battery has been fully charged and tells you when to unplug it, saving your batteries and extending their life dramatically. Also, you have the choice between two charging speeds. It is a great deal and a must for larger battery packs.