Super high capacity alkaline battery. Winner of Guinness World Record(TM) for longest lasting AA alkaline battery. Zinc Batteries - For light to medium duty applications. For example: Small torches, radios, basic toys, clocks and low powered items. Alkaline - The best quality batteries for use in high energy drain applications or continuous heavy use. For example: remote control toys, digital equipment, high powered portable radio cassettes. Alkaline is the best quality battery in most applications. New Ultra - Alkaline hi-tech applications. For example: Digital cameras/mobile phones.