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At 2020 there will be about seven million smart gas meters installed in the Netherlands, using batteries that are supposed to last for about 20 years. The long lifetime of the batteries is crucial, because an operation to replace them would be on a large scale and therefore expensive. Distribution System Operators (DSO’s) have to be able to rely on a lengthy lifetime. The Dutch DSO’s Netherlands (within Netbeheer Nederland), joined forces to carry out a unique study of the predicted and actual battery lifetime. In this study, batteries were examined from gas meters that had already been operating for 4-5 years. The results were promising: after 4-5 years: the actual (practical) lifetime of the batteries examined turned out to be in line with the predicted (theoretical) values.