Rayovac - RAY8158TFUS Fusion Premium AA Batteries delivers maximum performance to high-drain devices. These advanced, alkaline AA batteries are engineered with a Universal Power system to provide optimal performance in a wide variety of devices. Use these high-performance batteries daily in the most power-hungry devices, including your wireless microphone, video game controller and high-powered toys. An Enriched Core provides a longer battery life to keep your devices running and increases dependability to last up to 12 years in storage. Patent-pending Micro-Separator provides more room for active ingredients while its synthetic design increases reliability.