Associated Equipment 9640 12V 40 Amp Automatic Bench Top Charger with Override Switch Micro-processor controlled 40/45 amp bench charger and power supply Designed for AGM, gel cell, sealed and standard flooded batteries including orbital or optima batteries Electrical stability system (ESS) turns this charger into a stable power supply for extended service procedures or re-flashes Program diagnostics indicate weak or defective battery Made in the USA