The electricity mixed with the heat would form a reaction causing the battery to slightly melt {possibly a wrong theory} then explode.
It would evaporate
Heated gloves are headed with the use of a rechargeable battery.
Crystals of sugar are obtained.
Copper sulfate is formed.
Eventually if heated long enough (and hot enough) all the water would either eat the world or MELT (turning into steam), leaving behind nothing but solid salt behind. This is one way that you can remove salt from sea water in fact.
If a battery is placed in a microwave, it can potentially explode due to the release of gases inside the battery when heated. This can cause damage to the microwave and pose a safety risk. It is not safe to put a battery in a microwave.
if a reptile got over heated it would cook
It would evaporate
Heated gloves are headed with the use of a rechargeable battery.
Nothing good!
It wil be on
It would explode with wonderful joys of bacon existing on the Earth
Crystals of sugar are obtained.
You would short out the battery. If it was a car battery capable of 300 amps and the wire was big enough, the battery could explode.
You would melt your toaster. Magnesium burns with a white flame when heated in air.
You'd have a hot fig. It might pop if you heated it enough and the skin remained intact (until popping, of course).
I've never tried that, but I am pretty sure the battery would no longer work.