5x Exell S23PX 6V Silver Oxide Battery 4NR42 EPX23 V23PX 4LR42 PX23 Exell Batteries not only provide consumers with high efficiency, long-lasting performance, they also function as replacement batteries for an array of common and unique applications. Ranging from vintage camera equipment to sophisticated medical testing equipment, Exell Batteries can meet the needs of all consumers.The S23PX is a mercury-free replacement for the once popular Mercuric Oxide PX23 (or V23PX) battery cell that was commonly used in cameras, the Retina S2 Flash and Sennheiser microphones such as the Sennheiser K3U. Mercury cells are now banned because of toxicity and environmental fears.The silver oxide S23PX replacement for the PX23 produces 6.0 Volts, which is higher than the 5.6V produced by the original mercury PX23 cell. Most devices accommodate the small increase in voltage and function perfectly.6.0 V Replacement for: 4NR42, EPX23, V23PX, PX23, 4LR42, PX23A, RPX23A. Type: Silver Oxide. Voltage: 6.0 V. Diameter: 15.24 mm. Height: 20.5 mm. Also known as: 4SR42 / PX23S / RPX23S.SpecificationsOutput Voltage: 6V Chemistry: Silver Oxide Height: 20.5mm Diameter: 15.24mm Country of Manufacture: U.S.A.