50Amp battery support unit with user adjustable voltage levels. Essential tool to ensure stable vehicle voltage by supplying current on demand preventing data loss/corruption aborted tests & damaged electronic components whilst undertaking diagnostic test procedures. Also useful for maintaning battery condition in showroom vehicles & whilst performing ADAS calibrations. The Gysflash 50.12 is also a high tech smart charger capable of charging all battery types (lead acid gel Silver/Calcium EFB and AGM stop/start) without the need to disconnect the battery from the vehicle. Battery change mode keeps a constant 12v feed to prevent data loss whilst changing the battery. Built-in protection against polarity reversal over-voltage & short circuit.