I just bought a new diehard battery for my 07 nissan versa and taped to the Side was a little L shaped breather tube. I looked and there's a little hole on the side of the battery, where the breather fits. Do I need to use it? What does it do?
No do not bother with it. The battery maker just puts it there as a waste of your time and money. Just let any overflow spill down the side of the battery and ruin it, it will be fine.
i would put it on and direct it down away from anything that the acid could ruin