9-volt batteries have protruding contacts, making wiring easy.
Wiring batteries together provides a quick way to create a power source for electric projects requiring non-standard energy levels. Wiring two 9-volt batteries in a series will result in an 18 volt battery. In fact, 9-volt batteries themselves contain six 1.5 volt batteries wired in a series inside them. The same effect also occurs when placing multiple batteries in a device. Wiring the two batteries in parallel instead will add their milliampere-hours together, sharing the load across both equally and extending their lifespan.
Instructions
1. Cut three strips of wire, one of appropriate length to reach between the two 9-volt batteries and two reaching from the batteries to your project. Strip off 1/2 inch of insulation from both ends of each. You can also use three pre-cut jumper wires.
2. Wrap one end of a wire around the positive end of one 9-volt battery. Tighten the wire around the nub to keep it from falling off.
3. Attach the other end of the wire to the second 9-volt battery. For a parallel connection, wrap it onto the positive terminal on the second battery. To make a series, connect it to the negative end instead.
4. Connect one end of your second wire strip to the negative end on the 9-volt. Hook the final piece of wire to the remaining open terminal.
5. Take the loose ends of both wires and connect them to your project to power it up.
Tags: 9-volt batteries, 9-volt battery, wire around, Wiring batteries, your project