I bought some Duracell "Procell" batteries, a few years ago, on EBAY. These Procell batteries are designed with a higher charge, for police, EMT's, etc., and are seldom found in the stores. They are generally sold only in larger quantities, and EBAY seems to be the best source for them. Buying them in quantity...24 to 144 in a pack, from EBAY or Amazon, they are far cheaper, per battery, than anything in a store blister pack. I keep a good supply of the various sizes, and always include a good supply with the battery powered toys we give the little kids on birthdays and Christmas. IMO, these Procells are the best bang for the buck, and they last twice as long as anything else I've ever tried.