Duracell AA batteries and Duracell AAA batteries are very popular and power a huge range of devices. You will also find 9v batteries that are very popular for smoke alarms. Standard D and C batteries are often used in torches and radios. Coin batteries or button batteries are use to power small devices like car fobs and watches. we have all the sizes here from CR2032 which is the most popular down to a not so well known LR44 or CR1616. we also have PJ996 batteries that are used in large lamp torches.