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

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

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

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

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



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    14 Discussions


    7 years ago on Introduction

    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


    7 years ago on Introduction

    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.


    Reply 8 years ago on Introduction

    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.

    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?


    10 years ago on Step 2

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

    1 reply

    Reply 10 years ago on Step 2

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


    10 years ago on Introduction

    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.

    1 reply