Method for predicting the remaining service life of an accumulator, wherein the method comprises the step of: - performing a theoretical accelerated life testing to the accumulator in a form of use level acceleration in a cloud server (12, 31, 63) wherein at least the temperature experienced by the accumulator and the voltage of the accumulator are used as variable parameters, thereby obtaining a theoretically estimated service life of the accumulator, characterized in that the method further comprises the steps of: - taking in use history data of the accumulator saved in the cloud server (12, 31, 63) which history data comprise use parameters of the accumulator within currently elapsed use time comprising at least the voltage of the accumulator and environmental conditions of the accumulator where the environmental conditions comprise at least the temperatures experienced by the accumulator, - taking in use earlier measurement results and type data of other accumulators saved to the cloud server (12, 31, 63) where the other accumulators are of a similar accumulator type than the accumulator, - calculating an estimate of the remaining service life of the accumulator in the cloud server (12, 31, 63) by combining the theoretically estimated service life of the accumulator with the history data of the accumulator and with the earlier measurement results and type data of the other accumulators, and - reporting the calculated estimate of the remaining service life and/or operational state of the accumulator to an owner or user of the accumulator, to an authority, to a supplier or supervisor of the equipment, or to other agreed party over a telecommunication network to a terminal device (13, 64, 66) managed by the party in question. - performing a theoretical accelerated life testing to the accumulator in a form of use level acceleration in a cloud server (12, 31, 63) wherein at least the temperature experienced by the accumulator and the voltage of the accumulator are used as variable parameters, thereby obtaining a theoretically estimated service life of the accumulator, - taking in use history data of the accumulator saved in the cloud server (12, 31, 63) which history data comprise use parameters of the accumulator within currently elapsed use time comprising at least the voltage of the accumulator and environmental conditions of the accumulator where the environmental conditions comprise at least the temperatures experienced by the accumulator, - taking in use earlier measurement results and type data of other accumulators saved to the cloud server (12, 31, 63) where the other accumulators are of a similar accumulator type than the accumulator, - calculating an estimate of the remaining service life of the accumulator in the cloud server (12, 31, 63) by combining the theoretically estimated service life of the accumulator with the history data of the accumulator and with the earlier measurement results and type data of the other accumulators, and - reporting the calculated estimate of the remaining service life and/or operational state of the accumulator to an owner or user of the accumulator, to an authority, to a supplier or supervisor of the equipment, or to other agreed party over a telecommunication network to a terminal device (13, 64, 66) managed by the party in question.