This 4LR44 (PX28A A544 L1325) is a popular alkaline (Manganese Dioxide) cell that is commonly used in cameras and remote control devices. This 4LR44 (PX28A A544 L1325) 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.