A battery pack balancing method for a vehicle, the battery pack comprising: ∘ a plurality of battery cells, ∘ a battery balancer connected to each battery cell having a resistance R B connected in parallel to the battery cell, ∘ a cell monitor which measures the voltage of each battery cell and manages the battery balancer, the cell monitor and the battery cell being connected through an electrical wire having a resistance R C, ∘ computing means, characterised in that the balancing method is performed by the computing means and comprises the following steps: - a first calibration step modelling each electrical wire connecting the cell monitors and the battery cells and calculating a coefficient for each electrical wire when the battery cells do neither provide nor receive energy, the modelling comprising the following steps: ▪ connecting the battery balancer and measuring the battery cell voltage V(n), ▪ disconnecting the battery balancer and measuring the battery cell voltage V 0 (n), ▪ calculating the coefficient of each wire through R C t 0 / R B t 0 = V 0 − V / V, ▪ storing each coefficient R C (t 0) / R B (t 0) in a memory module, ▪ measuring the temperature of the battery cell and storing it in the memory module; - a subsequent management step performing a balancing process of the battery cells when a battery cell is unbalanced and compensating an error of voltage measurement by the following steps: ▪ measuring the battery cell voltage V and the battery cell temperature t 1 when performing said balancing, ▪ updating the electrical wire coefficient R C /R B to the measured temperature (t 1) of the battery cell by: • R C t 1 = R C t 0 * 1 + α C Δt • R B t 1 = R B t 0 * 1 + α B Δt wherein α C and α B are temperature coefficients of the resistances R C and R B, ▪ calculating the battery cell voltage V 0 by (V 0 -V)/V = R C (t 1) /R B (t 1). ∘ a plurality of battery cells, ∘ a battery balancer connected to each battery cell having a resistance R B connected in parallel to the battery cell, ∘ a cell monitor which measures the voltage of each battery cell and manages the battery balancer, the cell monitor and the battery cell being connected through an electrical wire having a resistance R C, ∘ computing means, - a first calibration step modelling each electrical wire connecting the cell monitors and the battery cells and calculating a coefficient for each electrical wire when the battery cells do neither provide nor receive energy, the modelling comprising the following steps: ▪ connecting the battery balancer and measuring the battery cell voltage V(n), ▪ disconnecting the battery balancer and measuring the battery cell voltage V 0 (n), ▪ calculating the coefficient of each wire through R C t 0 / R B t 0 = V 0 − V / V, ▪ storing each coefficient R C (t 0) / R B (t 0) in a memory module, ▪ measuring the temperature of the battery cell and storing it in the memory module; ▪ connecting the battery balancer and measuring the battery cell voltage V(n), ▪ disconnecting the battery balancer and measuring the battery cell voltage V 0 (n), ▪ calculating the coefficient of each wire through R C t 0 / R B t 0 = V 0 − V / V, ▪ storing each coefficient R C (t 0) / R B (t 0) in a memory module, ▪ measuring the temperature of the battery cell and storing it in the memory module; - a subsequent management step performing a balancing process of the battery cells when a battery cell is unbalanced and compensating an error of voltage measurement by the following steps: ▪ measuring the battery cell voltage V and the battery cell temperature t 1 when performing said balancing, ▪ updating the electrical wire coefficient R C /R B to the measured temperature (t 1) of the battery cell by: • R C t 1 = R C t 0 * 1 + α C Δt • R B t 1 = R B t 0 * 1 + α B Δt wherein α C and α B are temperature coefficients of the resistances R C and R B, ▪ calculating the battery cell voltage V 0 by (V 0 -V)/V = R C (t 1) /R B (t 1). ▪ measuring the battery cell voltage V and the battery cell temperature t 1 when performing said balancing, ▪ updating the electrical wire coefficient R C /R B to the measured temperature (t 1) of the battery cell by: • R C t 1 = R C t 0 * 1 + α C Δt • R B t 1 = R B t 0 * 1 + α B Δt wherein α C and α B are temperature coefficients of the resistances R C and R B, ▪ calculating the battery cell voltage V 0 by (V 0 -V)/V = R C (t 1) /R B (t 1).