Energizer Speciality Alkaline Batteries are designed to keep your devices running for longer. Providing power that is consistent and long-lasting, each battery provides you with fantastic value for money. A23/E23A batteries are for speciality use, perfect for keychains and other small devices that require a compact battery. Provided to you in a twin pack, these batteries can be stored for up to 2 years without any reduction in the level of quality.