Energizer AA4pk AA batteries power devices such as headlamps, digital cameras, and battery-operated screwdrivers. These 1.5V batteries have a nominal diameter of 14mm. Technical Specs Battery SizeAA Battery PerformancePremium Capacity - Batteries3,000 mAh Standard Battery SeriesMax Battery ChemistryAlkaline Voltage - Batteries1.5V DC Standard Battery Pack Size4 Max. Operating Temp.130 Degrees F Min. Operating Temp.0 Degrees F Shelf Life10 yr StandardsANSI -15A, IEC-LR6 ItemAA Battery Diameter0.55 in Height1.92 in Overall Height1.96 in