The Christie QDD "Dud Buster" Battery Charger, from Clore Automotive, features a Deep Discharge Recovery Mode for use on sulfated batteries, 70-amp fast charge rate and 300-amp engine starting assistance. The Deep Discharge Recovery provides extra initial charging voltage and automatically adjusts to normal charging voltage once sulfation is broken down and the battery begins to accept charging current. The QDD includes three 12V charging rates and a two-hour timer switch with a "hold" position.