This is a simple insructable which will graphically demonstrate how to wire multiple power sources together to get the voltage and current you need for your project.
You will see that this demo uses a couple of my Al/Air fuel cells but you should be able to use any power sources you like.
It is not required that all the power sources be the same and this can affect your output. For instance wiring 3V and 9V batteries in series will give you 12V
Step 1: Bill of Materials
In this example we will be wiring together two aluminum air batteries so we'll need a couple of batteries and some leads for interconnecting them.
A multimeter for measuring voltage and current also comes in handy.
Other power sources that can be used include battery packs, wall warts ( two 9V warts = 1 18V ) or just about anything else.