If you mean like AA or AAA, nothing. Absolutely nothing happens. If they both have an electrical current running, I don't know, it might be dangerous.
100 % think it is Nothing
Dead battery -will no longer charge.
The battery contains Sulfuric acid and this can burn the skin. The best treatment is to wash the effected part in cold water, much the same as any type of burn.
when sodium comes in contact with water,it results in an exothermic reaction to give sodium hydroxide.
changes color
There is no reaction between them
It changes color.
Tordon is a herbicide and when it comes in contact with skin, the skin will become irritated.
It changes color
it doesnt set as right
Nothing
Contact Metamorphism: When magma comes in contact with other rocks it will heat them and change them into new rocks. This often happens around an igneous intrusion.