1. A method for predicting loading capability of a battery comprising: measuring current I, voltage U and temperature T of the battery; forming an equivalent circuit with an equivalent circuit diagram -Uo-R-C S -, wherein Uo is voltage at t&equals;o, R is resistance and CS is capacitance; correcting input voltage U′ of the equivalent circuit diagram with respect to measured battery voltage U, the correcting containing as variables only current I, voltage U and temperature T and as a nonlinear term a logarithmic dependency on I; varying parameters of components of the equivalent circuit diagram and state variables; comparing measured values with corresponding values of responses of the equivalent circuit diagram of the battery; and determining the loading capability from matched parameters and state variables.