12 Volt Battery Hack! You'll be Surprised...

Picture of 12 Volt Battery Hack! You'll be Surprised...
Save $40 with this easy to do hack that takes less than a minute! Pay attention to the battery type as that is important.

This can also be done with a 9 volt battery!

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Step 1: It's so EZ!!

Picture of It's so EZ!!
I picked up a couple of A23 Energizer Batteries at Wal-Mart for $1.88. What a deal!! If you look carefully at an A23, there is a split in the label/housing. I used a small screwdriver and peeled away the housing revealing a piece of paper.

Step 2: What's inside??

Picture of What's inside??
Peeling back the paper, I found 8 (1.5 volt) button cell batteries!! These are perfectly good button cells that will work in any 1.5 volt device they fit in!

Step 3: Save $40!!

Picture of Save $40!!
I matched the battery at Radio Shack and 1 of those button cells cost $4.99! Do the math! This easy hack gets you 8 button cells for about 1/2 of what one costs! Have Fun, Be Sfae! Hope you enjoyed this EZ, money saving hack!
grharder3 years ago
Just tried this the other day (2-16-12) and it was still as described here. It was a generic brand though, so that may make a difference.
minimoto5 years ago
LISTEN UP THIS ONLY WORCKS WHITH ENERGISER. I opened up a 1.5v battery up and got 8 button battery's. Than I opened up a 9v battery and found 6 AAA batters inside. Last I opened up a 6v heavy duty battery up and found 32 AA or AAA I forgot !!!!!!!!
wrong 1.5 battery is actually a cell not battery 9 volt has 6 AAAA cells in it...(1.5v each) 6 volt has 4 large cells...(1.5v each) if a 6 volt had 32 AA or AAA batteries it would be 48 volts
shosh up alright thats just what i found and the 6v heavy duty has so got that many batteries otherwise it would last 5min in a torch
I have a question: Does anybody know if the info from this instructable is still usable? You know, if you can still find some A23 Energizer batteries a a relatively low price? Cause I noticed the date this was published is August 18, 2007, which was 2 years ago and the batteries could have changed since then.
"at" a relatively low price. P.S. Since seeing this Instructable, I have only looked at 1 WalMart for those A23s and couldn't find any. I don't mean any criticism by my previous ?, I just would like to find out where I can get some A23s, That's all.
alphaglider5 years ago
you spelled safe wrong
paqrat5 years ago
All nit picking aside, ( and the farther aside we can put the nit picking the better) , this it a most useful instructable. Thank you.
paqrat paqrat5 years ago
and for the nitpickers, it = is.
jerwhite5 years ago
I like the instructable. I like the point about it being a LR44 and not an SR44 but still a good instructable.
Just go on and guess what's in a 9 volt! I opened one thinking I couuld use it for an acid bomb (Don't ask) and I ended up with a few smaller batteries!
futzwith5 years ago
Thank You! This will come in handy!
gilleseg6 years ago
Freaking sweet. These batteries are used in remotes for Garage doors and we sell them were i work (it rimes with Bowes for about $1.88 for two batteries) Thanks man.
Okay, before I get into what I'm about to say, I should point out that I use this trick myself, and am not at all saying anything negative about this Instructable or KipKay for that matter, but there is a little clarification in order:

One important thing to note about this trick is that the small batteries in the 23A are NOT the same thing as the RadioShack watch battery given as an example. The RadioShack battery being compared to is an SR44, with silver-oxide chemistry, while the batteries in the 23A are alkaline LR44s. These discharge much faster than their silver-oxide cousins They also have a "flat" discharge curve, meaning that they work at full capacity throughout their lifetime, then abruptly stop working, as opposed to alkaline cells, which enter a sort of logarithmic loss-of-energy curve about halfway through their lifetime - i.e., they start "going flat" rather than just giving out all at once. Many things which use SR44s rely on this behavior, and may not work properly with LR44s. (

They're also a lot cheaper - you can buy a 20-pack of Maxell LR44 batteries for $3 on Amazon, for example. (, but there is one catch, and it's why I like this tip:

LR44s are extremely hard to find in brick and mortar retailers, and if you buy them online, you have to (1) wait for them, which may or may not be a problem, and (2) pay for shipping, which should immediately sound like a problem.

If you open up the Walmart 2-pack of 23As, you aren't getting as good a deal as the $3 20-pack, but since you tack at least $5 of shipping on there, the savings vanishes instantly. In other words, you'd have to not care about shipping delays and be in the market for at least 100 batteries for the Amazon deal to start making any sense.

If you don't need the special properties of the silver-oxide SR44 (I, for example, am just powering a pair of infrared LED fingertipped gloves, and wanted small 1.5V batteries), and don't ned a bajillion batteries, this trick is definitely worthwhile.

Plus, there are some neat tricks you can pull with the empty battery casing - I, for example, used some parts from it to make a holder for the little LR44s, 'cause I couldn't find one at RadioShack.
ya2sabes6 years ago
What brand of batteries have been proven to work with this hack? -Definitely Energizer? (and they have to be 12V and not the normal 1.2V?)
I opened up a RadioShack brand 12V 23A (RS 23-144) yesterday for a project I'm working on, and it's identical - bend-out casing, paper insulation, and eight LR44 batteries. Also... "...and not the normal 1.2V?" If you mean, say, AAs or AAAs, no, those are single cells, and they're actually 1.5V. If you open one of those up, you'll just get a handful of alkali metal hydroxide powder, which is rather caustic and not of much use unless you're trying to make salt.
agmilmoe6 years ago
Cool! I'm going to buy 8 button cells and tape them together to create a $40 A23!
The great wonders of destruction and picking apart of common household objects
CAR_RAMROD6 years ago
Very nice. I hate how much they charge for button batteries. I will keep this in mind thanks!
Blue_Flame7 years ago
Hey there, I was just wondering what type of button cell it is, 'cause the type no. of "394" isn't useful over in the U.K. Thanks
baneat7 years ago
Energizer and Duracell are excellent batteries that last for a long time. If A23s are made of button cells, expect similar quality.
penhaifai7 years ago
sweetn87 years ago
The instructions are very clear and the information that the button cell batteries are inside the A23 is correct. Price is really not the issue. Excellent hack.
phenoptix7 years ago
Great find! Thanks for sharing. You will get no nitpicking from me!!
atkulp7 years ago
Cool! Neat discovery! What type of battery is it? Is the code stamped on the cell like with regular ones?
Well duh Radio Shacks Prices are inflated because the have very little competition exept for local stores.
yea but button cells always cost a small fortune regardless of where you get em
lighten up! gosh
locofocos7 years ago
YES!!!!!! These are the batteries my laser pointer uses. Last time I replaced the batteries in it, it was about $17! It took three of these. Thank you SOOOOOOOOOOOOOO much!
lcohio7 years ago
Very useful info. I have a palm-pilot type thing that takes 3 button cells. I used to buy them @ radio shack until I saw this instructable. Kipkay, you are smart.