These hearing aid batteries we previously had no failures, single batteries, like Varta ECO, but these are also cheaper. That is why we have ordered again for my wife. Probably due to the hearing aid, maintains a battery about 4 days, regardless of whether used right or left. (However, all the other manufacturers, do not last longer) This for all the people here, probably indicating device related dream shelf lives of individual batteries. Since there are likely? particularly efficient appliances, hardly batteries must be changed where. In ours it is anyway, as described by me. Purchase, delivery and their Abwickelung satisfaction and when the batteries stay at our fullest so, next time gladly again ..........
