Optimum AA/AAA batteries, Duracell's #1 best performing alkaline batteries, are formulated with 4X the patented POWER BOOST™ Ingredients vs Coppertop AA and AAA. Compatible with any AA and AAA battery-operated device, these batteries are packaged in a pack with a reclosable storage tray for a more organized way to store your batteries. Duracell guarantees these batteries against defects in material and workmanship. From storm prep to holiday needs, Duracell is the #1 trusted battery brand for the moments that matter most. Battery Type: Alkaline; Battery Size: AA; For Use With: Everyday Electronic Devices; Voltage: 1.5 V.