content: nope. you can very briefly VERY BRIEFLY touch them together and make sparks.   its really cool.   This will probably severly shorten the life of a battery, so i would recommend doing it on an old one that you're about to return for the core charge.   (also dont try this at home because legalities, but its pretty cool looking.) Hell, ive hooked up a high-amp charger backwards on a car battery before.   It boils the liquid, not sure if it then explodes.  I heard a hissing noise, and removed the cables at the hissing stage.   Did not want to see if i could get to the explosion stage. Edit: also, if you ever want to see the sparks (legal disclaimer dont do this im just an idiot on the internet), make damn sure the battery is OUT OF TEH CAR and disconnected from the car before trying.    Seems like a really good way to fry an ECU and/or multiple sensors on the car.