Rayovac High Energy 9V Batteries (4 Pack) Alkaline 9 Volt Batteries Power your household with Rayovac High Energy 9 Volt Alkaline Batteries. Engineered for long-lasting performance these Rayovac 9V batteries are ideal for the high use devices in your home from your wireless microphone to high-powered toys and smoke detector batteries. Rayovac batteries are rigorously tested to ensure they do what they say they ll do—plain and simple. These alkaline 9V batteries last up to 5 years in storage. Each 9 Volt battery is made for dependable performance. For reliability in the devices you use each day count on Rayovac for 9 Volt batteries.