What Batteries Go in Smoke Detectors (Types & Tips)

Hey, everyone! I know how important it is to keep our homes safe from fires; smoke detectors play a huge role. So let’s talk about a crucial part of these life-saving devices: the batteries.

There are a few different options, including 9V and AA batteries. While 9V batteries have been the go-to choice for many years, some newer models of smoke detectors use lithium batteries that can last up to ten years.

But which option is the best for you? In this article, I’ll break down the different types of batteries available for smoke detectors and help you choose the one that’s right for your home.

Common Battery Types for Smoke Detectors

It’s essential to know which batteries to use to keep your home safe and protected. So, let’s dive right in!

9-Volt Alkaline Batteries

First up, we’ve got the 9-volt alkaline batteries. These used to be the go-to choice for smoke alarms, and you can still find them in many models.

They’re known for being affordable and widely available. Change them regularly—at least once a year—to ensure your smoke detector remains operational.

Lithium 9-Volt Batteries

Now, lithium 9-volt batteries are a step up from alkaline. They tend to have a longer lifespan (up to 10 years in some cases), which means you won’t need to replace them as frequently.

That’s a huge plus, as I’m all about making life easier! While they may cost a bit more upfront, their extended life can save you money in the long run.

AA Alkaline Batteries

a display of different brands of aa batteries
Video | DiodeGoneWild

You might be surprised that AA alkaline batteries are also common in smoke detectors. Nowadays, it’s not unusual to see two or three AA batteries powering a smoke alarm.

These batteries have about three times as much energy as a 9-volt alkaline battery, meaning they pack quite the punch!

Just like with the 9-volt alkaline batteries, replace them at least once a year for optimal performance.

AAA Alkaline Batteries

different aa batteries in an OPUS cell device
Video | ScottDotDot

Finally, AAA alkaline batteries aren’t as common in smoke detectors, but you may come across them from time to time.

If you need to replace a AAA battery in your smoke alarm, follow the manufacturer’s instructions and replace them as needed.

And that’s the scoop on common battery types for smoke detectors! While it might seem like a small detail, choosing the right battery can make all the difference in protecting your home and your loved ones.

Compatibility of Batteries with Different Models

BrandModelBattery Type
Kiddei120409V Alkaline
i46189V Alkaline
i120609V Alkaline
First AlertSA303CN39V Alkaline
9120B9V Alkaline
P101010-year sealed lithium battery
CO6159V Alkaline or 2 AA Alkaline
NestProtect6 AA Energizer Ultimate Lithium (L91)
or 6 AA Energizer Max (E91)
or 6 AA Duracell CopperTop (MN1500)
or 6 AA Panasonic (AM3PA)
or 6 AA Energizer Recharge (NH15)
Note: Always refer to the manufacturer’s instructions for your particular model’s recommended battery type and compatibility.

Compatibility may vary depending on the specific model and brand of the smoke detector.

How to Choose the Right Battery

a zoom image of the other end of an aa batteries

Choosing the right battery for your smoke detector is super important. It could differ between keeping your home safe and dealing with a disaster. So, here’s what you need to know.

First, a common choice for smoke detectors is the trusty 9V battery. These batteries have been used for years and are known to be reliable.

However, you have options like anyone adding a little flair to their home!

You might also encounter AA or AAA batteries in some smoke detector models. But let’s not forget about the long-lasting lithium batteries that can power your smoke detector for up to ten years!

Talk about low-maintenance, right?

Now, when choosing which battery to use, you want to consider the following factors:

  • Longevity: Let’s face it, we all want a battery that lasts longer. This means less maintenance and more peace of mind.
  • Reliability: You don’t want a battery that will fail when you need it the most.
  • Compatibility: Make sure your battery is compatible with your smoke detector. Trust me; you don’t want to find out your battery doesn’t fit after you’ve already taken it out of the package!

Speaking from experience, I prefer using batteries from trusted brands like Duracell or PKCELL.

These brand options have proven reliable, and let’s be honest, you want the best for your home’s safety.

To sum it up, pay attention to the longevity, reliability, and compatibility of the batteries you’re considering for your smoke detector.

As a bonus tip, test your smoke alarm once you’ve installed the battery to double-check everything is working perfectly!

Smoke Detector Battery Life and Performance

a hand putting duracell 9v battery to a smoke detector
Video | Andrew DIY

You know what, folks? I’ve been thinking about the importance of our trusty smoke detectors recently.

We often take them for granted, but they’re always there, quietly watching over us and helping keep us safe. So today, let’s talk briefly about the batteries that power these lifesavers!

The Old and The New

Back then, 9V batteries were the go-to choice for smoke alarms. But guess what?

Nowadays, it’s more common to see two or three AA batteries in these devices. AA batteries have about three times as much energy as a 9V. Who knew?

Consistency is Key

Whether you’re using 9V or AA batteries in your smoke detectors, checking on them regularly is essential. The rule of thumb? Replace your smoke alarm batteries every 6 months.

Trust me, a small investment in new batteries is worth the peace of mind in the long run.

If you’re not a fan of constantly swapping batteries, you might want to consider upgrading to a 10-Year battery model.

And remember, folks, always follow the manufacturer’s instructions regarding battery selection and installation. We want our smoke detectors to be in tip-top shape at all times!

So, there you have it! Next time you’re out and about, grab a pack of batteries for your smoke detectors.

It might be a small task, but it’s a crucial one. Stay safe and keep those smoke detectors powered up, my friends!

Wrapping Up

Choosing the right batteries for your smoke detector is crucial to ensure its proper functioning and to keep you and your family safe from the dangers of fire.

It’s important to remember that not all smoke detectors use the same type of battery. Some models require 9-volt alkaline batteries, while others require lithium batteries.

Always refer to the manufacturer’s instructions to know which type of battery to use. Moreover, testing your smoke detector regularly is also essential to ensure it’s in good working condition.

Remember that a properly functioning smoke detector can save your life, so don’t risk your safety.





  • “Residential Fire Rescue” by Kevin Day
  • “Smoke Detection and Fire Alarm Systems” by R.W. Bukowski and W.D. Walton
  • “Fire Detection and Alarm Systems: A Brief Guide” by John D. Hastie

Video References





Andrew DIY

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About Alex Robertson

c3c9d43f1f0d14c4b73cb686f2c81c4e?s=90&d=mm&r=gCertifications: B.M.E.
Education: University Of Denver - Mechanical Engineering
Lives In: Denver Colorado

Hi, I’m Alex! I’m a co-founder, content strategist, and writer and a close friend of our co-owner, Sam Orlovsky. I received my Bachelor of Mechanical Engineering (B.M.E.) degree from Denver, where we studied together. My passion for technical and creative writing has led me to help Sam with this project.

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