Best 9V Battery in 2021 (Reviews and Comparison)

Solar Energy Hub may collect a share of sales or other compensation from the links on this page. This comes at no additional cost to you, and all the prices and availability are accurate at the time of publishing.

We need a reliable, pack of 9V batteries that is both long-lasting in the appliance and also on our shelves. Scores of tools, toys, and household safety devices like smoke alarms and carbon monoxide detectors require batteries. The plethora of batteries on the market spoils us for choice. Which one is best? How can we decide? How many to buy?

Two things to ask yourself about 9V batteries is whether you want to use alkaline or lithium and rechargeable or disposable. Lithium batteries last longer and self-discharge at a slower rate, ideal for infrequently used appliances but unnecessarily expensive for others. Rechargeable batteries are expensive and will save you money in the long run but will take hours to recharge.

We’ll be comparing various alkaline batteries so you’ll know what best keeps safety devices at peak efficiency and toys working properly. Comparing in this way also allows you to see apples-to-apples comparisons.

COMPARISON CHART

Energizer MAX 9V Batteries, Premium Alkaline 9 Volt Batteries (8 Battery Count) 1. Energizer MAX 9V Batteries
  • Excellent overall performance for many devices.
  • PowerSeal technology protects against leakage and corrosion damage.
  • A good number of batteries to have a stash of extras.
CHECK PRICE
Amazon Basics 9 Volt Everyday Alkaline Battery - Pack of 4 2. AmazonBasics 9V Everyday Alkaline Batteries
  • Produced in high quantities – fresh and nearly never out of stock.
  • Great packaging for easy storage.
  • The anti-leakage design prevents acid damage.
CHECK PRICE
Energizer 9V Batteries, Premium Alkaline, 2 Count 3. Energizer 9V Batteries 2 Count
  • Excellent overall performance for many devices.
  • PowerSeal technology protects against leakage and corrosion damage.
  • Always have the freshest batteries possible.
CHECK PRICE
Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - 4 count 4. Duracell CopperTop 9V Alkaline Batteries
  • Duracell offers to replace any damage due to the failure of its batteries.
  • Works on a wide variety of household devices.
  • Excellent capacity.
CHECK PRICE
Rayovac Fusion 9V Batteries, Premium Alkaline Red/Silver, 2 Count 5. Rayovac Fusion 9V Batteries
  • Most powerful 9Vs created by Rayovac.
  • Excellent for high-powered electronics.
  • Retains its power for up to five years on the shelf.
CHECK PRICE
Read More

Energizer MAX 9V Batteries, Premium Alkaline 9 Volt Batteries (8 Battery Count)

Read More

Energizer MAX 9V Batteries, Premium Alkaline 9 Volt Batteries (8 Battery Count)

Read More

Energizer MAX 9V Batteries, Premium Alkaline 9 Volt Batteries (8 Battery Count)

Specification

Battery Cell CompositionAlkaline
Unit Count8 count
Product Dimensions1.36 X 4.15 X 1.99 in.
5-year shelf-lifeYes

Energizer has rightly earned its reputation for being a reliable brand that stays strong for a long time. These batteries also hold their power for up to five years sitting on your shelf waiting to be used, which gives you plenty of time to work your way through the whole pack. These 9V batteries will fit in various devices such as toys, tools, clocks, various detectors, and much more.

WHAT WE LIKE

Energizer designed them with leak prevention in mind – ensuring that the corrosive chemicals do not ruin devices or storage areas. Energizer utilizes its PowerSeal technology which ensures that your appliances are safe even up to two years after a battery has run out. The chances of corrosion damage are low – even if you forget about a device and leave the battery inside for a while.

Some packs contain duds or older stock that does not hold a charge so well.

PROS

  • Excellent overall performance for many devices.
  • PowerSeal technology protects against leakage and corrosion damage.
  • A good number of batteries to have a stash of extras.

CONS

  • Might not fit in some devices.
  • Some duds in the packs.
  • Older stock might not be removed from the store inventory.
Read More

Amazon Basics 9 Volt Everyday Alkaline Battery - Pack of 4

Read More

Amazon Basics 9 Volt Everyday Alkaline Battery - Pack of 4

Read More

Amazon Basics 9 Volt Everyday Alkaline Battery - Pack of 4

Specification

Battery Cell Composition Alkaline
Unit Count8 count
Product Dimensions1.04 x 0.69 x 1.91 in.
5-year shelf-lifeYes

Amazon produces these 9V batteries to be used in a wide variety of household devices, providing reliable performance consumers can trust. They can just sit idle in your cabinet for up to five years and not leak a single drop of corrosive acid. You can then suddenly pop them into a device, and they’ll perform as if you just brought them home.

These are sold in packs of four and eight, but it never hurts to have a few spares around – in case you need to replace one. Their viability means the extras you buy will be just as good and readily accessible when the one from the pack needs replacement. Keep some in your desk drawers in case of emergencies and trust that their design will see you through. It’s a small but positive note that they also come in packaging that is “frustration-free,” read “neat and easy to access.” 

WHAT WE LIKE

They tend to run out faster than other major brands, and their size is of concern for some devices. Their dimensions are a bit larger overall for many tools and appliances, so they simply will not fit.

PROS

  • Produced in high quantities – fresh and nearly never out of stock.
  • Great packaging for easy storage.
  • The anti-leakage design prevents acid damage.

CONS

  • Doesn’t perform as well as some of the major brands.
  • Slightly larger than most 9V batteries leading to fitting issues.
  • Shelf life might not be as long as advertised.
Read More

Energizer 9V Batteries, Premium Alkaline, 2 Count

Read More

Energizer Max 9V Batteries, Premium Alkaline 9 Volt Batteries (2 Battery Count)

Read More

Energizer Max 9V Batteries, Premium Alkaline 9 Volt Batteries (2 Battery Count)

Specification

Battery Cell Composition Alkaline
Unit Count2 count
Product Dimensions0.69 x 1.04 x 1.91 in.
5-year shelf-lifeYes

Sometimes you only order what you need, and this 2-battery pack is perfect for those times when you only need a couple to get you by. You’ll get the same PowerSeal technology and quality as the Energizer pack of eight but with fewer batteries.

WHAT WE LIKE

While you will have to buy replacements, you guarantee yourself to have fresh batteries all the time.

PROS

  • Excellent overall performance for many devices.
  • PowerSeal technology protects against leakage and corrosion damage.
  • Always have the freshest batteries possible.

CONS

  • They might not fit in some devices.
  • Will not have a stash of batteries.
  • Older stock might not be removed from the store inventory.
Read More

Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - 4 count

Read More

Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - 4 count

Read More

Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - 4 count

Specification

Battery Cell Composition Alkaline
Unit Count4 count
Product Dimensions0.4 x 6.0 x 4.5 in.
5-year shelf-lifeYes

Duracell’s CopperTop 9Vs make good on the brand identity that the company has built up for it. They go so far as to proudly display their 5-year guarantee of product viability on your shelf in the packaging. Keep a small collection of them, and rest assured that even after a couple of years in a drawer, they’ll perform as they should.

The CopperTop 9Vs design fits the needs of everyday consumers and their various devices, and it also prides itself on safety. The company adds an extra offer – should any of the battery’s safety features fail to work as intended. If any devices are damaged by malfunctioning batteries, Duracell will take it upon themselves to fix your device or pay for the replacement. It is a testament to their commitment to excellence.

WHAT WE LIKE

Duracell designed 9Vs to last and be highly versatile consumables. They easily power your electrical appliances like smoke detectors for a long time to keep your family and property safe. They can also easily power tools like your garage door opener or toys like a child’s racecar.

PROS

  • Duracell offers to replace any damage due to the failure of its batteries.
  • Works on a wide variety of household devices.
  • Excellent capacity.

CONS

  • Might get old batteries in-store; check the package.
  • Some batteries did not hold charge well.
  • Duds are in some packs.

5. Rayovac Fusion 9V Batteries

Read More

Rayovac Fusion 9V Batteries, Premium Alkaline Red/Silver, 2 Count

Read More

Rayovac Fusion 9V Batteries, Premium Alkaline Red/Silver, 2 Count

Read More

Rayovac Fusion 9V Batteries, Premium Alkaline Red/Silver, 2 Count

Specification

Battery Cell Composition Alkaline
Unit Count4 count
Product Dimensions0.4 x 6.0 x 4.5 in.
5-year shelf-lifeYes

The Fusion 9Vs can remain on your shelves and maintain their power for up to five years, so do not hesitate to keep a small stash of them on standby. Rayovac designed them with safety in mind and added safeguards to prevent corrosive substances from leaking out and causing damage to your property.

You’ll be able to run some of the most power-hungry devices using these 9Vs and keep them running. However, these batteries are also known for having problems holding their charge, and no one enjoys discovering some duds in their new purchase.

WHAT WE LIKE

Rayovac designed the Fusion 9V batteries to be its most powerful 9V alkaline batteries. They withstood testing and have shown they are excellent for high-powered toys and electrical appliances like wireless microphones. They are versatile and will also work equally well in other electrical devices such as smoke detectors or carbon monoxide detectors.

PROS

  • Most powerful 9Vs created by Rayovac.
  • Excellent for high-powered electronics.
  • Retains its power for up to five years on the shelf.

CONS

  • Does not hold its charge for too long.
  • Some new packs contain duds.
  • Size and fit make them unusable with some devices.

Frequently Asked Questions

Do 9V batteries work on smoke detectors?

Smoke detectors work with 9V batteries depending on their make and model. It is easy to check if you can reach the device; all you have to do is open up the smoke detector battery section and see what it uses. It will typically use either cylindrical AA batteries or rectangular 9V batteries.

If your detectors are in hard-to-reach places, like on very high ceilings, we recommend calling replacement service providers rather than risking injury to yourself. 

Also, some smoke detectors plug directly into your home electrical system (hardwired). If this is the case, don’t worry about them running out of power.

Final Thoughts

Technically, you could throw money at a device to run it with just about any 9V battery. However, we judge based on design, durability and performance.

We recommend the Energizer MAX 9V Batteries for their excellent overall performance and their versatility. The PowerSeal technology is an excellent addition to an already superb product and guarantees a level of protection above its competitors. Imagine unknowingly damaging your smoke alarm with a lesser battery and then replacing it, thinking it is working at peak performance.

Come back and join us for more product reviews so you can remain a savvy consumer!

Leave a Comment