Rayovac 9V batteries are 34% off at Amazon, and the 8-pack covers several smoke detectors or devices at once. The batteries carry a 5-year storage guarantee, so extras can be kept on hand for later use. Shipping is free for Prime members. Buy Now at Amazon
Features
9 Volt Batteries, 8 Pack of High Energy Alkaline Batteries Ideal for High Use 9V Battery Devices Toys, Clocks, Smoke Detectors & More Designed to Prevent Damaging Battery Leaks & Tested Twice Prior to Shipment Rayovac 9V Batteries Hold Power Up to 5 Years in Storage
