Procedure for the manufacture and assembly of a battery charger for vehicles, the procedure characterized by comprising the following steps: - arranging at least a first electronic board having a first printed circuit, a plurality of electronic components suitable for processing power supply voltages and currents, a plurality of wound components, at least a first power connector of substantially elongated shape and at least a first control connector; - arranging at least a second electronic board having at least a through opening suitable for allowing the passage of said first power connector, wherein said second electronic board further comprises a second printed circuit and a plurality of electronic components connected together on the printed circuit to define a control circuit and at least a second control connector which can be connected to said first control connector; - arranging at least a third electronic board comprising a third printed circuit and a plurality of wound and power components connected together on the third printed circuit to define an electronic power circuit and having at least a second power connector which can be connected to said first power connector; - associating said second electronic board with said first electronic board, wherein said step of associating comprises inserting said first power connector through said through opening and connecting said second control connector to said first control connector; - associating said third electronic board with said second electronic board, wherein said step of associating comprises connecting said second power connector to said first power connector; - depositing a thermo-hardening material onto at least one portion of said first electronic board in correspondence to said first control connector and said first power connector; - solidifying said thermo-hardening material for locking said first control connector and said first power connector onto said first electronic board. - arranging at least a first electronic board having a first printed circuit, a plurality of electronic components suitable for processing power supply voltages and currents, a plurality of wound components, at least a first power connector of substantially elongated shape and at least a first control connector; - arranging at least a second electronic board having at least a through opening suitable for allowing the passage of said first power connector, wherein said second electronic board further comprises a second printed circuit and a plurality of electronic components connected together on the printed circuit to define a control circuit and at least a second control connector which can be connected to said first control connector; - arranging at least a third electronic board comprising a third printed circuit and a plurality of wound and power components connected together on the third printed circuit to define an electronic power circuit and having at least a second power connector which can be connected to said first power connector; - associating said second electronic board with said first electronic board, wherein said step of associating comprises inserting said first power connector through said through opening and connecting said second control connector to said first control connector; - associating said third electronic board with said second electronic board, wherein said step of associating comprises connecting said second power connector to said first power connector; - depositing a thermo-hardening material onto at least one portion of said first electronic board in correspondence to said first control connector and said first power connector; - solidifying said thermo-hardening material for locking said first control connector and said first power connector onto said first electronic board.