The word "电池" (diànchí), meaning "battery", is formed through a direct, conceptual combination of its two component characters: "电" (diàn), which means "electricity", and "池" (chí), which means "pool" or "pond". It is constructed by the logical idea of a "pool of electricity" or a "container for electrical charge", where the first character defines the essential substance or energy, and the second character provides a tangible, physical metaphor for a vessel or reservoir that stores it. This creates an immediate mental image of a device whose primary function is to hold and supply electrical power.