Single-use alkaline batteries which power a range of household appliances: brand names include Duracell and Energizer. They are best suited to low-drain devices such as LED headlamps and flashlights, although they can also be used in high-drain devices such as digital cameras although they won't last as long. The cathode is usually powdered manganese dioxide (sometimes mixed with graphite). The anode is zinc. The reaction is non-reversible meaning that with an alkaline electrolyte there is no easy way of restoring the electrolyte.