Instructables

How to open a 9v battery

Picture of how to open a 9v battery
with just some pliers and a good quality 9v battery you can open a 9v battery without damaging the internal cells so they can be used as a replacement AAA battery

oh and by the way THIS IS NOT DANGEROUS you are not opening up a cell you are opening up a battery (batteries have cells joined together)
 
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Step 2: Somewhere to start

Picture of somewhere to start
get your pliers and pinch the middle of one of the long sides then bend th metal back, don't worry about the dints in the metal it makes just keep going. you may have to do this a couple of times to get the metal lip up but when you do things suddenly get easier.

Step 4: Corners

corners are a bit trickier than the rest of the battery. use the corner of the battery that is closer to the fold in the steel. lift the lip of the other side then do the corner, usually the corner sort of scrunches up a bit but this is normal.

Step 8: Shake, shake, shake!

Picture of shake, shake, shake!
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give the battery cells inside a good shake and all of the cells should fall out along with the bottom. if you open up the bottom layered sort of thing you will find this silicon layer, i have no idea what it might be used for but keep it anyway.
durgledoggy3 years ago
Why don't you start opening it up at the seam that is already there for you?
cdousley4 years ago
make sure its not one of the solid metal 9 volts!!!
If you take apart the $1 ones sold at target, they're carbon cells sealed in wax, very very messy. ;-(
I opened one of those up and I was like, "WHOA! What is THAT?!!?!?". Instead of finding some nice little AAAAs, I found a nice little plastic wrapped block of chemicals or something.
Some 9v batteries have loose AAAA cells in them between the jumper plates, others have the cells tied together with spot welded straps. You should be able to rip the straps off though. Yet other batteries have flat rectangular (rounded corner) cells. I've seen those loose, wax-dipped and plastic-encapsulated, depending on brand and/or type.
merseyless (author)  Tool Using Animal6 years ago
actually i used one of those battery's first but when it came to getting it out, the thing stuck so i had to delete all of the pictures and start again.
yes i got #%&$ by a sunbeam. same type of cells. :-(

iProton4 years ago
Seems I have messed it up. The batteries started hissing, with bubbling.
I think the silicon might be used to keep the plastic bottom from getting hot and melting. But what can I use those little batteries for?
merseyless (author)  extremegtafan5 years ago
as mini power sources
They are AAAA batteries.Not AAA batteries. They hold very little charge and cannot supply a good amount of current, so they cannot be used as AAA batteries.
The batteries are a replacement for AAA batteries.
the silicon stuff is to put pressure between the cells and the connections it is hard but squeezable.
they are almost the same length as AAA batteries, so you use the metal tabs stuck to the paper/cardboard as spacers, and use them as AAA's.
I use the case to house small circuit projects. If you make your circuit board the right shape and size, you can fit 5v regulators for power supplies or other small circuits inside of it, poke a hole in the bottom part for a wire to go out, and you can reuse the terminals to connect to a "real" 9v for power (or to a battery pack that has the same connector).
Oh, and Rayovac 9v's (fairly common) contain the stacked rectangular plastic-cased cells. I've taken apart two of them (dead ones) to use the case for electronics projects. These stacked cells are fairly useless other than as a 9v source, so I recommend using the battery first and then dismantling it for the case and terminal.
maplin do to does it say on the positive terminal "us patent no 5691079 pat .pend in several countries"
I'll probably sound stupid for asking this but what are AAAA batteries and what are they used for???
AAAA batteries are what you see in the pictures and are just the next size down from the AAA batteries.
a lot of low-power lasers use aaaa's
also compaq's tc1000 tablets use them for the pen
so ur saying i can take over the world by using low powered mildly annoying mining lasers??? my plans r finally becoming a reality!!!!!!!
lol!
i sound stupid too but are all the battery companys 9v batterys the same i mean do they all look like the one u took apart. i just dont want to open one and have some odd chemical start pouring on my hands and burn them.
merseyless (author)  chi chi chippy5 years ago
if you don't find small batteries you'll find a wax block instead. its not a CELL its a BATTERY (batteries have cells in them) just don't go pulling apart the cells you find in there... unless you don't like your fingers.
pinkpooj6 years ago
You can use the ends to build a 9v connector for a project... just reverse the polarity as compared to a 9v.
reeding6 years ago
you make this too complicated
BC-456 years ago
9V hacku can use the casing to hide ure money or anything u want just make sure it looks like a 9V battaery here a site that i got it from nvm cant find it SASUKE OUT
qqqqqq5826 years ago
I opened one of these this way. After, when I was holding the cells, one actually exploded in my face!!! and it was a new battery!?!
ooooch
Which is why it would explode.

short circuit => heat => pressure = ...
Lftndbt6 years ago
You'll notice on the energizer's that the AAAA, are not true enclosed batteries in an air tight casing. They have an opening around the rim of the terminal.. Unlike the store bought version's.... the exterior 9V case does that job.... Often "budget" 9V battery's do not have the AAAA's, but rather a single cell filling the housing... I guess it's just cost effective/convienient, for larger companies to use them... I like AAAA's, very versatile when modding torches.... See how many AAAA's you can get in the same space as a D or even 3 x AA's...
Lftndbt6 years ago
The good ole' AAAA.... Nice ible.... Don't forget they are just as easy, if not easier to remove them from the bottom.. ;)
jtobako Lftndbt6 years ago
Are you saying that accidentally shorting the terminals with the pliers is a Bad Thing : ) ?
Lftndbt jtobako6 years ago
That's an added bonus.. ;) Perhaps why qqqqqq582 had an issue... sparks + open battery cells dont mix well sometimes.... ;)
Good!!! I like it!
i had huge problems with this before, but i figured it out. :-)
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