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.