Why not a battery? (Score 1)

Why would I want to use electricity to produce hydrogen which will net less electricity upon recombination than it required to split in the first place? Why wouldn't I direct the electricity straight into a battery? Even if there was a more effecient way to get pure hydrogen (I guess this heating system would produce it as a by product?) - why wouldn't I recombine it for electricity right away and use that to power my house and my electric car? Can anyone explain why a tank full of hydrogen is better than a battery?