How to Make A Simple Hydrogen Fuel Cell

Step 7: 9-Volt Battery

Next, connect the leads to the 9-volt battery. Keep it on for a second, (You will observe that bubbles will be forming on one of the electrodes. And then immediately disconnect the leads from the 9-Volt Battery and connect the leads back to the multimeter. The Multimeter will now show some voltage such as 0.43 volts or  0.85 volts depending on the amount of time you kept the battery pack connected. You can actually use this voltage to power small objects such as a LED with the amount I used. On a Large Scale, it can power a Car or large electrical appliances.