The type of energy transformation that occurs in a battery is from chemical energy to electrical energy. Inside a battery, chemical reactions take place between the electrolyte and the electrodes. When the battery is connected to a circuit, the stored chemical energy is converted into electrical energy, allowing it to power devices. This conversion is fundamental to the operation of many electronic devices, including smartphones and laptops. When the battery is depleted, the process can be reversed during recharging, restoring the chemical energy stored within.