EN91 is an Energizer Industrial AA alkaline battery engineered for reliable power delivery across a wide range of consumer and industrial devices. The battery features a zinc-manganese dioxide (Zn/MnO2) chemical system with a nominal voltage of 1.5 volts and a nominal internal resistance of 150 to 300 milliohms when fresh. It operates reliably across a temperature range of -18°C to 55°C and delivers approximately 2500 to 3000 mAh capacity under continuous discharge to 0.8 volts at 21°C, with a typical shelf life of 7 years at 21°C. The EN91 is ideal for remote controls, portable lighting, toys, CD/game players, tape players, and digital cameras, offering consistent performance and long-term reliability for both intermittent and continuous-use applications.