* Batteries store chemical energy. The chemical reactions within the battery release electrons, creating an electrical potential difference.

* When you use a battery, you draw on that stored chemical energy. The electrons flow through the circuit, powering your device. This process consumes the chemicals within the battery, converting chemical energy into electrical energy.

Let's break down why the other options are incorrect:

* Electrical to chemical: This is the reverse process of what happens in a battery. It's how you *recharge* a battery, not how it functions normally.

* Thermal: While some heat may be generated as a byproduct of the chemical reactions within a battery, it's not the primary energy conversion happening.

* Chemical: This doesn't describe an energy conversion. Chemical energy is simply stored within the battery.