yes put aluminum foil extending from the positive to negative an feel the heat!!
yes Batteries only produce direct currents
Batteries. You need them to generate the power.
NO!
No, 1.5v AA alkaline batteries do not typically generate enough heat to melt plastic. They may get warm during use, but not hot enough to cause plastic to melt.
Batteries use chemical energy to create voltage to drive current flow. They do not use nuclear energy.
Yes, two or more batteries connected in series can generate a higher voltage than one alone.
To make a fire using batteries, you can create a spark by connecting the positive and negative terminals of the batteries to a conductive material, such as steel wool or a piece of wire. The electrical current passing through the material will generate heat, which can ignite flammable materials like paper or dry leaves to start a fire.
The difference between tubular and flat plate batteries are heat dissipation and lead alloy. Tubular batteries hold heat, where flat plate batteries disperse heat. Tubular batteries also have no reserve of lead alloy, which leads to corrosion by sulphuric acid.
No, voltaic cells (most of what you call "batteries" are actually voltaic cells) work by oxidation and reduction. "Isothermal convection" is a term with which I am unfamiliar that seems like an oxymoron; if everything is the same temperature (isothermal) then convection won't occur, because temperature differences are what drive convection.
Too much heat going into batteries, batteries are damaged, or batteries manufactured wrongly
No, plants do not generate heat as part of their metabolic processes.
To start a fire using batteries, you can create a spark by connecting the positive and negative terminals of the battery to a conductive material like steel wool or a wire wool. The electrical current passing through the material will generate heat and ignite it, starting a fire.