The ESS6007B Associated Automotive Battery Charger 12V 40Amp/130Amp Boost Intellamatic has Electrical Stability System (ESS™) for re-flashes. With nominal 13.7 volt DC output technology, the ESS6007B is a stable power supply for extended service procedures. It also has a program for deep discharge recovery of flooded batteries and patented diagnostics that will indicate if a battery is weak or defective. Designed to charge all types of 12 volt batteries including; AGM, Gel Cell, Sealed, and Standard Flooded batteries (including: Spiral Cell, Orbital™, or Optima™ batteries). Not to mention this charger also has Dead Battery Override Control and it is safe to operate in any weather.