Battery-Packs-2-x-9V-Energizer-S15280-p-Energizer-MAX-reg-9V-Alkaline-Batteries-have-a-zinc-manganese-dioxide-Zn-Mn O2-chemistry-with-no-added-mercury-or-cadmium-They-will-hold-power-for-up-to-5-years-in-storage-Typical-applications-include-smoke-alarms-carbon-monoxide-detectors-&-other-moderate-current-drain-devices-p-p-Supplied-as-a-pack-of-2-p-Energizer-S15280-Battery-Packs-2-x-9V