I am visiting my parents for the holidays, and my dad and I just finished refilling the water in my car battery. I come to find out from my mother that what we thought was a gallon of 'water' is actually fertilizer dissolved in water. Did we just make a bomb? I feel like we're going to end up on the next episode of 1,000 ways to die. Maybe I should siphon this out

 

I am also curious if the metals present within the fertilizer could react with the acid to form undesirable products and/or precipitates. She said she only used about a teaspoon of miracle grow per gallon, so it's not very concentrated. And we added a fairly small amount.

 

Thanks!

The good news is that neither plants nor batteries like chlorides.

You won't have done the battery any favours- but you probably won't have done any real damage, and you almost certainly haven't done anything dangerous.