Hydrogen

It’s abundance in the world is overwhelming, it can be easily made from water and once the energy in hydrogen has been used it returns to its original form,... water

In order for hydrogen to be made, electricity is needed to electrolyse water into hydrogen and oxygen. Therefore hydrogen is not an energy source, but an energy carrier, like a battery

Hydrogen and batteries each have their advantages. Whereas the energy density of hydrogen is almost a 100 times higher, energy storage in batteries will be more efficient as there are very few losses. Basically meaning that low energy consuming electronics that can be easily recharged will remain to be battery powered, whereas high energy consuming electronics or very big energy storage will be hydrogen powered.