Method for estimating the state of charge of an electric battery of an electrified vehicle implemented in a supervision system of electrified vehicles comprising electric recharging means connected to an electrical power supply network and ensuring electrical recharging of said electric battery, at least one remote supervision equipment hosting a remote supervision software system of connected vehicles and a wide area wireless communication network, the vehicle comprising a device for wireless communication adapted to transmit data to the remote supervision equipment through said network and an infotainment computer provided for the provision of navigation parameters on board the vehicle, this method comprising, at the start of an electric recharging session, a first communication of data from said electrified vehicle to the supervision equipment, said first data communication comprising communicated data including first values of an effective state of charge (SOCR) of said battery and navigation parameters from the computer and representative of a speed of recharge and a residual autonomy of driving at the time of said first communication, characterized in that it further comprises, during said electric recharge session, an estimation and a provision of an estimated state of charge (SOCE) by said supervision equipment, said estimated state of charge (SOCE) being determined at from said communicated data and from a first value α 0 of a correction factor a of the recharging speed, said first value α 0 being recorded in a database of the supervision equipment, the estimation of the estimated state of charge being calculated from an estimation equation equal to the following relation: SOC E t n = SOC R t 0 + α ∗ t n − t 0 ∗ CR ∗ SOC R t 0 AR ∗ 3600 Or: - SOC E (t n) is the estimated value of the state of charge at an instant tn, - SOC R is the effective value collected by the monitoring equipment at a instant tO prior to tn, - α is the correction factor recorded in the database, - CR is a parameter representative of the charging current determined from the charging speed, - AR is the parameter representing a calculated remaining rolling capacity from the residual driving range. connected to an electrical power supply network and ensuring electrical recharging of said electric battery, at least one remote supervision equipment hosting a remote supervision software system of connected vehicles and a wide area wireless communication network, the vehicle comprising a device for wireless communication adapted to transmit data to the remote supervision equipment through said network and an infotainment computer provided for the provision of navigation parameters on board the vehicle, this method comprising, at the start of an electric recharging session, a first communication of data from said electrified vehicle to the supervision equipment, said first data communication comprising communicated data including first values of an effective state of charge (SOCR) of said battery and navigation parameters from the computer and representative of a speed of recharge and a residual autonomy of driving at the time of said first communication, characterized in that it further comprises, during said electric recharge session, an estimation and a provision of an estimated state of charge (SOCE) by said supervision equipment, said estimated state of charge (SOCE) being determined at from said communicated data and from a first value α 0 of a correction factor a of the recharging speed, said first value α 0 being recorded in a database of the supervision equipment, the estimation of the estimated state of charge being calculated from an estimation equation equal to the following relation: SOC E t n = SOC R t 0 + α ∗ t n − t 0 ∗ CR ∗ SOC R t 0 AR ∗ 3600 Or: - SOC E (t n) is the estimated value of the state of charge at an instant tn, - SOC R is the effective value collected by the monitoring equipment at a instant tO prior to tn, - α is the correction factor recorded in the database, - CR is a parameter representative of the charging current determined from the charging speed, - AR is the parameter representing a calculated remaining rolling capacity from the residual driving range. - SOC E (t n) is the estimated value of the state of charge at an instant tn, - SOC R is the effective value collected by the monitoring equipment at a instant tO prior to tn, - α is the correction factor recorded in the database, - CR is a parameter representative of the charging current determined from the charging speed, - AR is the parameter representing a calculated remaining rolling capacity from the residual driving range.