Like anything else in daily use, smoke detectors have a lifespan. Manufacturers say that a detector should be replaced after 10 years of service. During those 10 years, the battery typically goes dead and is replaced five to 10 times. Sometimes, it is never replaced at all—many batteries are removed the first time the “low battery” alarm sounds and then simply forgotten.



Why is it necessary to replace the batteries so often? Many people select ordinary alkaline or carbon-zinc batteries for smoke alarm use. Smoke alarms require constant, low-level power, and this demand quickly drains these ordinary batteries.

Dead or removed batteries pose a significant safety risk—disabled smoke detectors are a factor in many home fire injuries. Some states legally require “long-life” ionization-type detectors that are equipped with a 10-year smoke alarm battery. It makes sense—if a detector is going to be working hard for 10 years, all batteries for smoke alarm use should go the same distance.

Ultralife batteries are standard equipment in most of these long-life detectors, and they can bring the same performance to your smoke alarm. The ultralife 9-volt lithium battery is designed and guaranteed to be a 10-year smoke alarm battery in ionization-type smoke detectors. These batteries use leading-edge, UL-listed lithium technology to maximize life and ensure safety, and they are available in a plastic or weather-resistant aluminum housing.

Medic Batteries offers Ultralife 9-volt lithium in discount bulk packs, so you can easily and affordably upgrade each detector in your home or office with a 10-year smoke alarm battery. Same-day FREE shipping—puts safety and low maintenance right around the corner; the next trip up the ladder can be your last for a decade.

If you need batteries for smoke alarm use, it’s an easy decision: Replace the battery in each smoke alarm every year, or go with Ultralife, the battery designed to last the life of your alarm.