Step 1: Cost Comparison of Power Sources
Step 2: Materials and Tools
Bamboo stake (available at garden centers)
2 pieces of bare copper wire
Markers to label the polarity
Bamboo stake (quantity depend on the number of batteries you are replacing)
One piece of bare copper wire per conductor piece
Hot glue gun
Step 3: Bamboo "Batteries"
This is the most important piece to make for this project. To make the battery piece, cut a hole in the center length of the bamboo and arrange the wires as in picture 2. Loop the ends of the wires. The connector may be clipped and saved for other projects. To keep the wires from moving, you may use hot glue. Never let the wires touch!
The conducting pieces may or may not be needed at all. They take the place of the other batteries. To make the conducting pieces, put the copper wires through the ends of each piece and loop the ends to keep them from falling out. Make sure their wires don't touch their neighbor's. If there is poor contact, you may fill the ends with aluminum foil
If you want, you can also make a USB Bamboo "Battery" by using a USB cable instead of an adapter.
Always measure the voltage before using it. They are usually 33% higher than stated when there is no load so it is safer to choose a lower voltage. Make sure the adapter doesn't overheat.