Generally, the best 9v battery for a smoke detector may last anywhere from 6 months to 2 years. Meanwhile, 9V lithium batteries typically have a longer lifespan and may last up to 5 years or more.

and they're more affordable than lithium batteries. Check out CNET's picks of the best alkaline batteries before you stock up. Laboratory Technical Project Manager Gianmarco Chumbe has been part ...

Generally, the best 9v battery for a smoke detector may last anywhere from 6 months to 2 years. Meanwhile, 9V lithium batteries typically have a longer lifespan and may last up to 5 years or more.

With such an important safety appliance, consistent power is essential, so it bodes well to know if you're using the best ... as 9v batteries as well as C, D, AA and AAA sizes. A lithium option ...