A three-phase synchronous rectifier for charging a battery on board the vehicle, comprising a first and a second input which are independent of each other and each connectable to a respective first and second three-phase output branch of a generator, two independent negative and positive outputs each connectable to the respective poles of the battery, a first group of three rectification units configured to be connected to the first output branch of the generator via said first input, a second group of three rectification units configured to be connected to the second output branch of said generator via the second input. Advantageously, the rectification units are configured to be simultaneously connected to the battery of the vehicle.

An intrinsically safe battery assembly includes a battery pack including at least one battery and a protection circuit connected in series with the battery pack. The protection circuit includes the following elements connected in series: at least one diode configured to prevent the battery pack from being reversely charged, at least one current limiting resistor configured to provide short circuit protection and a resettable fuse configured to provide over current protection.