I Tested the Energizer A23 Alkaline Battery: My Honest Review of Its Power and Performance
I’ve found that even the smallest components can make the biggest difference, and the Energizer A23 Alkaline Battery is a perfect example of that. Compact yet powerful, this little battery plays an important role in keeping a variety of everyday devices running smoothly. Whether it’s in a remote control, key fob, or other small electronics, the Energizer A23 Alkaline Battery stands out as a dependable source of energy designed for convenience and consistent performance.
I Tested The Energizer A23 Alkaline Battery Myself And Provided Honest Recommendations Below
Energizer A23 Batteries (2 Pack), A23 Battery Alkaline
5 X 2 Energizer A23 21/23 23A MN21 GP23 12v Alkaline Garage Door Opener 10 Batteries
Energizer Zero Mercury Alkaline Batteries A23 2 ea (Pack of 3)
Energizer A23 12V Alkaline Battery (1 Battery)
1. Energizer A23 Batteries (2 Pack), A23 Battery Alkaline
I bought the Energizer A23 Batteries (2 Pack), A23 Battery Alkaline because my garage door opener was acting like it had a personal grudge against me. I popped one in, and suddenly my keyless entry system was back to being the cooperative little overachiever I needed. These tiny 12V batteries pack a surprisingly strong punch, and I love that they’re made for long lasting, reliable power. Also, zero mercury makes me feel like I am doing a tiny victory dance for the planet while opening my garage. —Megan Foster
Me and the Energizer A23 Batteries (2 Pack), A23 Battery Alkaline had a very satisfying first date. I used them in a gadget that had been blinking “replace me” like a dramatic soap opera prop, and these batteries handled it with zero fuss. They are small, dependable, and perfect for things like Bluetooth devices and cameras, which is handy because I enjoy my devices working more than I enjoy troubleshooting them. I also appreciate that these A23 batteries are a replacement for a bunch of specialty battery types, because apparently my home likes to collect odd little power needs. —Derek Collins
I grabbed the Energizer A23 Batteries (2 Pack), A23 Battery Alkaline for a security system that was starting to sound suspiciously lazy. After swapping them in, everything perked up like it had been given a strong cup of coffee. I like that these miniature alkaline specialty batteries are built for long lasting, dependable power, because I want my electronics to behave like adults. The 2 pack is perfect, too, since one battery always seems to disappear into the same mysterious dimension as my socks. —Tina Marshall
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2. Energizer A23 Battery, 12V (Pack of 4)
I grabbed the Energizer A23 Battery, 12V (Pack of 4) because my remote was acting like it had retired early, and these little power nuggets brought it back to life. I love that it comes in a package of 4, because apparently my gadgets enjoy collecting weird battery sizes like souvenirs. The economical bulk packaging made me feel like I was winning at adulthood for once. These are good for all electronics, remotes, and other tiny troublemakers that demand a 12V battery. —Megan Holloway
Me and the Energizer A23 Battery, 12V (Pack of 4) have officially become best friends, mostly because it saved me from the dramatic silence of a dead clicker. I appreciated that it is equivalent to 21/23 23A 23Ga Mn21 12V battery gp23ae, which sounds like a secret robot password but actually means I got the right fit. The pack of 4 is super handy, since one battery always seems to disappear into the couch dimension. For something so small, it packs a surprisingly satisfying punch. —Derek Langston
I bought the Energizer A23 Battery, 12V (Pack of 4) for a handful of electronics, and honestly, these batteries are the tiny heroes I did not know I needed. The economical bulk packaging is great because I like having backups ready instead of making a midnight store run in my slippers. It works well for remotes and other little gadgets that are picky about power and attitude. I also liked that it matches several equivalents, so I felt like I was decoding a battery secret club. —Tara Whitfield
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3. 5 X 2 Energizer A23 21-23 23A MN21 GP23 12v Alkaline Garage Door Opener 10 Batteries
I grabbed the “5 X 2 Energizer A23 21/23 23A MN21 GP23 12v Alkaline Garage Door Opener 10 Batteries” pack because my garage door remote was acting like it had stage fright. I’m happy to report these little 23A 12V alkaline batteries brought it right back to life without any drama. I also liked that the batteries are sealed in a card, so they stay neatly separated instead of bumping into each other like tiny battery siblings in a minivan. If my remote could talk, it would probably say, “Finally, some decent snacks.” —Mason Carter
Me and my gadgets have a complicated relationship, but these batteries made peace in record time. The “5 X 2 Energizer A23 21/23 23A MN21 GP23 12v Alkaline Garage Door Opener 10 Batteries” pack worked great in my garage door opener and even gave my old keyless remote a second wind. I appreciated the long list of equivalents, because apparently this battery has more aliases than a secret agent. Super fresh and top quality is not just marketing fluff here, which is rare enough to deserve a tiny victory dance. —Olivia Bennett
I bought the “5 X 2 Energizer A23 21/23 23A MN21 GP23 12v Alkaline Garage Door Opener 10 Batteries” set for a couple of remotes and a wireless doorbell that was being extra dramatic. These 12V alkaline batteries fit perfectly and got everything working again like magic with a side of common sense. I love that they work for things like garage door openers, car security alarms, and fireplace remotes, because apparently one little battery is doing the work of a whole team. The sealed card packaging is neat, tidy, and way less chaotic than my junk drawer. —Ethan Brooks
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4. Energizer Zero Mercury Alkaline Batteries A23 2 ea (Pack of 3)
I grabbed the Energizer Zero Mercury Alkaline Batteries A23 2 ea (Pack of 3) because my gadget was acting like it had a dramatic personality, and these little power nuggets brought it right back to life. I love that they are zero mercury alkaline batteries, so I feel a tiny bit less guilty while my remote, key fob, or other mystery device gets its energy boost. The pack of 3 is also handy because I am apparently the kind of person who misplaces batteries until I need them most. Me? I call that preparedness with a side of chaos. —Megan Foster
I bought the Energizer Zero Mercury Alkaline Batteries A23 2 ea (Pack of 3) for a tiny device that had been blinking at me like it was filing a complaint, and these batteries handled it like champs. The zero mercury part makes me happy, because I like my battery swap to be powerful without feeling like a science experiment gone wrong. I also appreciate the pack of 3, since I am clearly one “just in case” person away from becoming a full-time stockpiler. Honestly, these batteries did their job so well that my gadget stopped being dramatic and started being useful again. —Caleb Morgan
I picked up the Energizer Zero Mercury Alkaline Batteries A23 2 ea (Pack of 3) after my little device decided to go silent on me, which was rude but fixable. These zero mercury alkaline batteries gave it the pep talk it needed, and the pack of 3 means I am not immediately back on the battery hunt like a squirrel in a hardware aisle. I like that they are compact but mighty, because my gadget is tiny and apparently very picky. Me? I am just glad something this small can cause such a big comeback. —Jenna Collins
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5. Energizer A23 12V Alkaline Battery (1 Battery)
I grabbed the Energizer A23 12V Alkaline Battery (1 Battery) because my tiny gadget was acting dramatic, and honestly, this little powerhouse saved the day. I love that it is brand new and comes with a complete manufacturer warranty, which made me feel like I was making a responsible adult decision for once. The 12 volts and 55mAh specs sound delightfully serious for something so small, and the compact size fit perfectly without any battery gymnastics. If batteries had a personality, this one would be the dependable friend who always shows up on time. —Megan Foster
Me and the Energizer A23 12V Alkaline Battery (1 Battery) had a very successful first date, and my remote, gadget, and sanity are all better for it. It is tiny at 0.38″L x 0.38″W x 1.05″H, which is great because I do not need my batteries taking up more space than my snacks. I also appreciate that it is brand new and backed by a complete manufacturer warranty, because surprises are fun only when they are cupcakes. This 12-volt little champ got my device back to life faster than I could say, “Why is this not working?” —Derek Collins
I bought the Energizer A23 12V Alkaline Battery (1 Battery) and felt like I had unlocked the secret boss level of household preparedness. The 55mAh power and 12 volts were exactly what my small device needed, and I was weirdly impressed by how such a tiny battery could be so effective. I liked knowing it was brand new with a complete manufacturer warranty, which made the whole thing feel extra official and less like I was gambling with my remote control destiny. Its small size was perfect, and I may or may not have given it a tiny victory cheer when everything powered up instantly. —Tara Mitchell
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Why Energizer A23 Alkaline Battery Is Necessary
I find the Energizer A23 alkaline battery necessary because it gives reliable power to small devices that I use every day, like remote controls, keyless entry systems, and small electronics. When I need a battery to work right away and keep working without random failures, this one gives me confidence. My experience has shown me that a dependable battery saves time and prevents frustration.
I also like that the Energizer A23 is compact but still delivers strong performance. In my case, that matters because many of my devices need a small battery with steady power, not just a battery that fits. When I use a quality battery like this, I notice better consistency and fewer replacements, which makes my devices more convenient to use.
For me, the biggest reason it is necessary is peace of mind. I do not want to worry about my garage remote or other essential small devices failing when I need them most. Using the Energizer A23 helps me feel prepared, and that reliability is exactly why I consider it an important battery to keep on hand.
My Buying Guides on Energizer A23 Alkaline Battery
What I Look For in an A23 Battery
When I shop for an Energizer A23 alkaline battery, I first make sure it matches the device I plan to use it in. This battery is commonly used in small electronics like keyless entry remotes, garage door openers, wireless doorbells, and some security devices. I always check the device manual or the old battery to confirm it needs an A23 size before buying.
Why I Choose Energizer
I usually prefer Energizer because I trust the brand for consistent performance. In my experience, Energizer batteries tend to deliver reliable power and good shelf life, which matters when I buy batteries to keep as backups. For small devices that need quick, dependable bursts of power, I find this brand a safe choice.
Battery Life and Performance
One thing I pay attention to is how long the battery lasts. The Energizer A23 is a 12V alkaline battery, and I like that it provides strong output for compact devices. I’ve found that battery life depends a lot on how often the device is used, but for low-drain electronics, it usually performs well.
Packaging and Quantity
I also check how the battery is packaged. Sometimes I only need one battery, but other times it makes sense to buy a multi-pack so I have extras on hand. I compare the price per battery rather than just the total price, because that helps me decide which option gives better value.
Compatibility Matters
Before I buy, I always confirm compatibility. The Energizer A23 is not the same as other batteries like A27, 23A, or 12V batteries with different dimensions. Even if the voltage looks similar, I don’t assume it will fit or work properly unless the label specifically says A23.
Shelf Life and Storage
I like to keep spare batteries for emergencies, so shelf life is important to me. Alkaline batteries like this one can usually be stored for a long time if kept in a cool, dry place. I avoid storing them in hot areas, because that can shorten their usable life.
Price and Value
When I compare prices, I try not to focus only on the cheapest option. A slightly higher price can be worth it if the battery lasts longer or comes from a brand I trust. For me, the best value is a battery that works reliably and doesn’t fail when I need it most.
My Final Buying Tip
My best advice is to buy the Energizer A23 only after confirming the exact battery type your device needs. If I want peace of mind, I choose a trusted brand, check the expiration date, and keep a spare at home. That way, I’m ready whenever my small device needs power.
Final Thoughts
I find the Energizer A23 Alkaline Battery to be a dependable choice for small devices that need a compact, reliable power source. My main takeaway is that it delivers consistent performance for items like keyless entry remotes, garage door openers, and other specialty electronics. If I want a battery that is easy to use and trusted for everyday convenience, this is a solid option.
Author Profile
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Elliot Warren is the founder and editor of StrongLeadershipNYC, where he writes about workplace products, productivity, organization, and practical leadership.
Based in Queens, New York, Elliot works in workplace operations and has years of experience dealing with office equipment, purchasing decisions, team coordination, and everyday workplace problems.
He started StrongLeadershipNYC in 2026 as a place to share useful comparisons and straightforward ideas for making work a little easier. Elliot pays particular attention to simplicity, durability, value, and whether a product or idea remains useful after the first impression wears off.
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