Keep the smoke alarm powered for years with a 9 volt lithium battery.
Wholesale Pricing on Lithium 9Vs
You may be able to save some cash and go with alkaline 9 volt batteries for easy-to-reach detectors, but for the tougher alarms located high up or around stairs, we recommend the L522 9 volt Energizer Ultimate Lithium battery. Lithium batteries last longer and you don't need to swap in a new one every 6 months when the clocks change. Find out more about how to buy the best 9 volt smoke detector batteries.