The Exell A220/504A 15v Alkaline Battery (NEDA 220 LR154 10F15) gives you high efficiency and long-lasting performance. This alkaline battery can be used for a wide array of applications such as for vintage cameras and medical testing equipment. It is cylindrical in shape, and it features an alkaline cell that is a perfect replacement for the hard-to-find Eveready 504 batteries. The alkaline cell is much more reliable than the older carbon-zinc battery of the older 504. The Exell A220/504A 15v Alkaline Battery (NEDA 220 LR154 10F15) is an excellent replacement for the Eveready 504 batteries.