Hi,
Hydrogen is a colorless, odorlees, gas so you wouldn't smell it. What you may be smelling is Sulphuric acid vapor (in a heavily diluted form). I wouldn't worry about hydrogen fumes in a home where the furnace runs regularly, it'll consume the Hydrogen as it cycles on/off. What you do not want is a small restricted space where Hydrogen gasses can concentrate.
If the battery is even in a 10"X10" room, that's plenty of space to dilute it to the point where an explosion simply won't happen if the source of hydrogen is a 6-cell 12V Wet Cell battery. I wouldn't worry about it...
Happy Motoring!... Jim'99
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