The Exell Battery L28PX battery is a popular silver-oxide cell are commonly used in cameras (such as the Minox 35ML, Bronica GS-1 and Canon AE-1), light meters and blood sugar testers. This Exell Battery L28PX battery is a popular replacement for the now discontinued PX28 mercury battery. These mercury batteries, no longer manufactured because of their toxicity, were variously known as PX28, 4MR44, V4034PX, 4H-C, 4NR44, HM-4C.Exell Battery is one of the few product lines Proudly Assembled in the USA. Made with Alkaline cells, Exell Batteries will last longer and offer consumers excellent reliability. 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. Also known as: L544, L544BP, V28PXL, K28L, 2CR11108, PX28L, 2CR1/3N, CR28L, 1406LC.