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The Mastervolt ChargeMaster Plus 12/75-3 is a next-generation battery charger designed to integrate multiple functions into a single device, replacing auxiliary chargers, battery isolators, and VSRs. It is built for versatility, capable of charging virtually any combination of two or three batteries quickly and safely, and operates globally with support for worldwide AC voltages and frequencies.

This charger features the Battery’s Best Friend architecture, allowing it to charge a multitude of battery chemistries, sizes, and voltages using the 3-step+ charge method. Notable features include a revival mode for depleted batteries, priority charge to direct power to the lowest battery, and smart input for charging three batteries from a single alternator while underway. It also offers power supply mode for delicate equipment and operates within a wide input voltage range of 80-275 V AC.