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By breaking open either Duracell or Energizer (I don't know about other types) you can save money.

Step 1: Gathering Materials (And Some Notes)

In order to do this you will need
A 9-volt battery
Pliers
A mini flathead screwdriver (Optional)
Duct Tape
Conductive and easily crusher material (I used aluminum foil)
A small dish (To hold metal shavings)
Scissors
An aaa battery (Optional, but it makes it way easier to size the battery padding)

Note, to clarify, you will not be prying open any cells (The things with battery acid inside) you are just prying open a battery. You will not need to do anything with acids.

Step 2: Getting the Cells Out.

Pry off the bottom (the side that doesn't have the connectors) of the 9-volt battery, remove the small piece of black plastic, then pull out the 6 plastic wrapped 1.5v cells.

Step 3: Seperating the Cells

Take the pack of cells and pull the black piece connected to the batteries off of them. Then cut or rip off the plastic wrap on the cells.

Step 4: Seperating the Cells, Part 2

Pull on the two pieces of metal poking up from the pack of cells until one of the pieces of metal holding the cells together breaks. Using your pliers, pull all the pieces of metal off the cells. Make sure to keep track of these as they are very sharp.

Step 5: Bulking Up the Cells.

Ball up a piece of the foil so that it has a form something like _A_
Now put this on the side of the cell that doesn't have a bump. Strangely enough, this is +
Then wrap the whole thing with duct tape until it is approximately the size of the sample aaa. Cut off the extra and you have a AAA battery!
This won't work for many 9 volt batteries. Some are just a plastic cell inside with layers, verticly, not AAAAs
Ummm, the mAh ratings of batteries vary highly, but on average, a sub-AAAA or AAAA battery has a much shorter lifespan than a AAA battery... you are likely losing money, and doing more work for it... in addition, as you are using more cells for a certain period of use, you are also contribution to the amount of hazardous materials that your area has to deal with....<br/><br/>just think about it this way ... a duracell mn21/A23 security battery is about half the size of a AA. It costs about $5 and gives 12v... a car battery costs $40 for 12v... maybe, with enough duct tape, I could use a $5 security battery in my car... (I just gave myself an idea... off to the garage... tallyho!!)<br/><br/>this is the same sort of thinking that drives the sale of Konnoc batteries and AAA to D cell adapters.<br/><br/>it is my opinion that all battery manufacturers should be required to list mAh on the package, and on the battery itself, so the customer can more easily buy based on dollars/(milli-Amp * Hours) It would be educational, and would promote greener buying habits.<br/>
You are could be correct in saying people will lose money doing this, but it depends. When comparing alkaline AAAA and AAA batteries, the AAAA ones have half the capacity. If you're lucky, you should be able to find AAA batteries at low prices. This is still a great way to get AAAA batteries when required. And it does not contribute to the waste. If you used the 9v battery, you would have the same amount of waste from the battery anyway.
im so sorry but i just had to quote this; "You are could be correct"
I'm sorry if this is a really stupid question but I am quite a newb to electronics in general. How can a 1.5 volt battery differ from any othe 1.5 volt battery if their voltages are the same?
The current capacity is measured in amp / hours. 1 amp / hour is the ability to output one ampere for one hour. A rule of thumb for batteries using the same chemical reaction (carbon, lead/acid, alkaline etc...) is the larger the battery, the more power (amp/hours) it will have. That is why a D cell will power the same device for a longer period of time than an AA cell. Hope this helps!
good explanation, except for one bit... Amp Hours are Amperes multiplied by hours, not divided by hours.
You are of course correct. I was using the forward slash as a separator rather than an operator. I'll be more aware of symbology in the future. Thanks for the catch!
The actual mAh provided by a particular battery varies depending upon its usage patterns. Low currents, high currents, intermittent load, steady load, ambient temperature, a lot of things can change the mAh's you get out of a particular battery.
true, but there are more common usages, and as a comparison, a number would be nice... what about listing mAh as the measurement at STP for a constant draw of 350mA (a common amount). For AA, AAA, and 9v batteries, that would be a relatively useful figure. you could vary the mA draw for various sizes of battery, and put the test draw right on the packaging, so there'd be little confusion.
Lemme know if anything comes of the car battery :P
Arent these AAAA batteries?
OH sorry should have read the posts
For some reason, these are shorter than *normal* AAAA batteries..<br/>
Those are AAAA (that's 4 A's) batteries, not AAA. Good luck finding a use for them.
a lot of pen lights use them. and 4a batteries are expensive. this is a good way to get them
my bluetooth headset uses them :P
Never mind, I actually read and saw you bunched up the foil on the end to make it longer.
You get more bang out of your buck when batteries are used in series. There is usually 6 cells in a 9 Volt and AAAs are usually used in pairs or 4 of them in a series. So you'll actually be able to drawn out less of the energy you paid for if you disable a 6 cell and used it in a 2 or 4 cell configuration.
Sorry but it's been done to death. Well written and all but anyway...
the aaaa batteries only come out of certain brands of 9-volts. i think its only energizer and duracell that use them. others have a large cell
or buy some rechargeable AAAs and a charger from DX for the cost of 4 or 5 of those 9 volts...

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