We are members of a local running group and speed walking group, in the winter we go out Monday through Thursday evenings for a 1 hr training run/walk on the local roads. To assure visibility on dark winter evenings we use safety lights which take these batteries. The lights flash brighter and last longer with quality batteries and we can be sure we will be seen by the drivers. The price for comparable batteries at the local drug store and electronic store would make replacing batteries redundant as the batteries cost more than the cost of buying new lights! The price and quality make buying them from Well.ca 'well' worth it, especially when they arrive at your door within a couple of days.