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AA Alkaline Battery - 1.5V LR6 Standard Cell | Energizer

The Energizer AA (E91) is a 1.5V alkaline zinc-manganese dioxide (Zn/MnO2) primary (non-rechargeable) cylindrical battery in the standard AA form factor (14.5 x 50.5 mm), one of the most widely used consumer and industrial battery sizes in the world. It is manufactured under the IEC designation LR6 and ANSI designation 15A, with a typical service capacity of 1500-3000 mAh depending on discharge load. An alkaline battery is a primary electrochemical cell that uses zinc powder as the anode and manganese dioxide as the cathode in an alkaline potassium hydroxide electrolyte. Compared with legacy zinc-carbon Leclanche cells, alkaline cells deliver roughly 5-10x higher energy density, lower internal resistance (150-300 milliohms fresh), and superior shelf life - making AA the default portable power source for household electronics, industrial sensors, medical devices, and consumer IoT products. Key features include a nominal 1.5V output, fresh internal resistance of 150-300 milliohms, operating temperature range of -18C to +55C, and a shelf life of up to 10 years at 21C storage. The Energizer E91 datasheet (energizer.com/pdfs/e91.pdf) specifies 3000 mAh typical capacity at 25 mA continuous discharge to 0.8V cutoff. The cell weighs 23 grams in a 8.1 cm3 plastic-jacketed package rated for consumer and bulk industrial distribution. The E91 uses a flat contact terminal configuration compatible with virtually all AA-battery holders. Its 1.5V nominal voltage is a direct drop-in for legacy carbon-zinc AA cells (which share the same dimensions), while delivering substantially longer runtime in high-drain applications such as digital cameras and motorized toys. Low-drain applications such as remote controls and wall clocks can expect years of operation from a single cell. Typical applications include remote controls, wireless mice and keyboards, wall clocks, portable radios, flashlights, toys, smoke detectors, and consumer IoT sensors. The AA form factor is also the workhorse of low-cost industrial test equipment and many medical devices including infusion pumps and digital thermometers. When designing with the AA form factor, plan for end-of-life voltage drop - most devices are designed for 1.5V nominal but the cell voltage drops steadily to 0.8V cutoff. For applications requiring stable voltage across discharge (e.g. precision analog circuits), consider a DC-DC boost converter after the cell. Storing cells above 55C accelerates capacity loss. This page consolidates Energizer E91 datasheet specifications, distributor pricing tiers, drop-in equivalents (LR6, MN1500, AM3), and practical design guidance for engineers and procurement professionals sourcing the AA form factor.