Introduction: Making a 4.5 Volt Battery Pack From a 9V Battery

Picture of Making a 4.5 Volt Battery Pack From a 9V Battery

This instructable is all about splitting a 9V battery into 2 smaller 4.5V battery packs.

The main reason for doing this is
1. You want 4.5 volts
2. You want something physically smaller that a 9V battery

Step 1: Dismantle Your 9V Battery

Picture of Dismantle Your 9V Battery

This is your chance to be destructive. Peel back the casing of the 9V battery and you will find 6 AAAA (yes quadruple A) batteries. Each battery produces 1.5V.

Step 2: Separate 3 Batteries and Tape Them Up

Picture of Separate 3 Batteries and Tape Them Up

Next you want to seperate a set of 3 batteries, ensuring that they stay connected to each other. Tape them up with electrical tape so they form a neat bundle.

Step 3: Add 2 Leads

Picture of Add 2 Leads

Next, solder a piece of wire to each end of the battery chain. These will be the positive and negative battery terminals.

Step 4: Tape the Whole Thing Up

Picture of Tape the Whole Thing Up

Nothing hard here. Tape the whole thing up into a secure bundle.


crabsmash (author)2012-11-10

will this cause heating issues?

gauravgarg (author)2012-04-16

Can someone tell the details of this battery cells,i opened them and what i found were cells of carbon,can someone give me more information on that please

rayish6 (author)2011-11-25

hey, does this work with an eveready battery, because i opened it and what i see is the one on the left, and i dont know how to do this.

techturtle2 (author)2010-08-26

You can buy AAAA batterys at radioshack

codongolev (author)techturtle22010-11-09

they're probably ridiculously expensive though. I went there to get a three volt button cell and it was like, four dollars. I got a perfectly good package of five of them at the flea market some time later for a dollar.

mikethe1wheelnut (author)2010-01-17

so, the million dollar question:  do these have to be new batteries?  can you do it with old batteries?  I just tried it, and it blew up trice in my face!  well, not exactly, more like -past- my face.  I was lucky (and smart) not to be looking down the 'barrels' of the battery!  the expiry date of the one that blew up on me was march 2003.  Perhaps I will try again with a brand-new battery?

jackie_eva (author)2009-05-24

what's a lead, and where can i gat it?

sharlston (author)jackie_eva2009-10-19

its wire

a lead is just a name for the (preferably thick) wire or pin connecting the battery to the rest of the circuit.

WoutervD (author)2009-04-26

The set of three, how is it arranged? Like: +++ + - + ? or ? - - - - + - ?

protostack (author)WoutervD2009-04-28

+ - + | | | | | | | | | | | | | | | | | | - + - Does that help ?

xerxesx20 (author)2009-04-21

I think it should be noted somewhere on this page that not all 9V batteries contain AAAA cells. Some contain fat, dirty cells stacked and wrapped in waxy epoxy, messy if dissasembled. Alright if kept in original configuration, I have an alkaline one that I charge with my photovoltaic cells via it's soldered on connections. I think it tends to be the more expensive batteries that contain AAAA cells.

xerxesx20 (author)xerxesx202009-04-21

Forgot to add that I like the simple instructable. :-)

Owzcarde (author)2009-04-16

this instructable will be great for beginners :)

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