Updated August 2026 Every junk drawer in America contains batteries that fit nothing in the house. The sizes look similar, the packaging all promises long life, and the chemistry names, alkaline, lithium, NiMH, sound interchangeable when they are not. This guide sorts out the five household sizes, which devices take which, what the chemistry differences actually mean, and when rechargeables beat disposables. It ends with the case for buying in bulk, since that is what we sell: brand-new, factory-sealed Energizer and Duracell batteries at below-retail prices. The five household sizes Household batteries are standardized, so any brand's AA fits any...