- The MXS 3.8 is an advanced microprocessor-controlled battery charger with patented Float/Pulse maintenance for use on batteries from 1.2 Ah up to 85 Ah. The MXS 3.8 solves a broad range of battery problems and is the ideal charger for everyday use. Features of the MXS 3.8 include diagnosis of battery condition to establish if it can receive and…