What is the typical lifespan, in years, of modern smoke alarm lithium batteries?

What is the typical lifespan, in years, of modern smoke alarm lithium batteries?

• A. 12
• B. 8
• C. 15
• D. 10

Answer: (D)

Modern smoke alarms with lithium batteries are designed to last about 10 years. In many models the lithium battery is sealed inside and cannot be replaced, so the unit itself is typically replaced when that 10-year life is reached. That makes 10 years the standard lifespan for the battery in contemporary, sealed-li-ion smoke alarms. Older or non-sealed models with replaceable batteries don’t follow this same timeline, but for the modern sealed units, the decade-long lifespan is the norm.

Modern smoke alarms with lithium batteries are designed to last about 10 years. In many models the lithium battery is sealed inside and cannot be replaced, so the unit itself is typically replaced when that 10-year life is reached. That makes 10 years the standard lifespan for the battery in contemporary, sealed-li-ion smoke alarms. Older or non-sealed models with replaceable batteries don’t follow this same timeline, but for the modern sealed units, the decade-long lifespan is the norm.