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 . <EOS>