I bought this alkaline button cells for my "Boker Swiss Light Led Light". An assembly keeps in continuous operation for about 7 hours and corresponded approximately to the purpose specified by Boker average maturity values. Maybe the more expensive here button cells last longer but at a price of 1.75 euros is not relevant to me. The button cells are preserved in their original packaging to consume until October 2019 /. So I can live very well. I would buy it again, unless there is eventually a more environmentally friendly alternative to the Boker Swiss Eye to assemble. Thank you for reading this review.