The Optimate 3 is a unique affordable 6-step 'all-in-one' 12V battery optimiser, totally automatic and fully protected against user errors. There are no switches and short-circuiting the charger output resets the program, without sparks or blown fuses. The Optimate 3 is affordable, compact, intelligent and forgiving of errors, making it the perfect tool for regular or long-term maintenance of batteries not in daily use. Designed to diagnose, recover, charge, test and optimally maintain automatically. The OptiMate 3 retains all the fully automatic, 100% safe, easy-to-use characteristics, of the 2 million OptiMates produced since 1995, but is now microprocessor-controlled, lighter and more efficient than ever, plus it's 33% more powerful than its predecessor!6-Stage Cycle:1. Safety check: OptiMate 3 must be connected to a battery (retaining minimum 2V) to activate its output.2. Desulfation and recovery: if due to sulfation the battery's resistance is abnormally high, a voltage of up to 2