Hi heineraa,
It seems as if you are doing a demonstration instead of an experiment.
From what you have told us, you are making a hydrogen battery, but there are no variables you are changing.
Are you seeing if certain "ingredients" will make the hydrogen battery more powerful?
If a homemade or store-bought battery is more powerful?
Just know that a hypothesis is what YOU think. There's no going wrong with a hypothesis.
Remember that you should always include reasoning behind your hypothesis.
For example, a basic format for a good hypothesis is:
I think that _______, BECAUSE _________. State what you think and back it up with reasoning.
This reasoning should come through a bit of background research.
Most of all, have some fun! Don't stress too much.
