Method for determining the ability or inability of a battery to supply a predetermined power level for a predetermined time, comprising: • a step of estimation of the state of charge SOC of the battery; • a step of measurement of the temperature T of the battery; • a step of determination, from the estimated state SOC and from the measured temperature T, of the ability or of the inability of the battery through the use of an adaptive statistical model, the method being characterized in that said determination step includes: ∘ a step of estimation, from the estimated state SOC and from the measured temperature T, of a probability P α (SOC,T) of the battery being capable, in which P α denotes a probability law with at least one parameter α with the value α1; ∘ if P α=α1 (SOC, T) ≥P threshold, in which P threshold denotes a probability threshold between 0 and 1, a step of supply, by the battery, of the predetermined power for the predetermined time, including: ▪ a substep of measurement of a voltage V min at the terminals of the battery during the supply; ▪ a substep of measurement of a current I max passing through the battery during the supply; ∘ if V min ≤V threshold or if I max ≥I threshold, in which V threshold denotes a voltage threshold and I threshold denotes a current threshold, a substep of modification of the value of the parameter α to a value α2 such that P α=α2 (SOC, T) <P α=α1 (SOC, T). • a step of estimation of the state of charge SOC of the battery; • a step of measurement of the temperature T of the battery; • a step of determination, from the estimated state SOC and from the measured temperature T, of the ability or of the inability of the battery through the use of an adaptive statistical model, the method being characterized in that said determination step includes: ∘ a step of estimation, from the estimated state SOC and from the measured temperature T, of a probability P α (SOC,T) of the battery being capable, in which P α denotes a probability law with at least one parameter α with the value α1; ∘ if P α=α1 (SOC, T) ≥P threshold, in which P threshold denotes a probability threshold between 0 and 1, a step of supply, by the battery, of the predetermined power for the predetermined time, including: ▪ a substep of measurement of a voltage V min at the terminals of the battery during the supply; ▪ a substep of measurement of a current I max passing through the battery during the supply; ∘ if V min ≤V threshold or if I max ≥I threshold, in which V threshold denotes a voltage threshold and I threshold denotes a current threshold, a substep of modification of the value of the parameter α to a value α2 such that P α=α2 (SOC, T) <P α=α1 (SOC, T). ∘ a step of estimation, from the estimated state SOC and from the measured temperature T, of a probability P α (SOC,T) of the battery being capable, in which P α denotes a probability law with at least one parameter α with the value α1; ∘ if P α=α1 (SOC, T) ≥P threshold, in which P threshold denotes a probability threshold between 0 and 1, a step of supply, by the battery, of the predetermined power for the predetermined time, including: ▪ a substep of measurement of a voltage V min at the terminals of the battery during the supply; ▪ a substep of measurement of a current I max passing through the battery during the supply; ▪ a substep of measurement of a voltage V min at the terminals of the battery during the supply; ▪ a substep of measurement of a current I max passing through the battery during the supply; ∘ if V min ≤V threshold or if I max ≥I threshold, in which V threshold denotes a voltage threshold and I threshold denotes a current threshold, a substep of modification of the value of the parameter α to a value α2 such that P α=α2 (SOC, T) <P α=α1 (SOC, T).