The battery light indicator in the instrument cluster of a Toyota Camry typically comes on when there is a problem with the vehicle's charging system. This could be due to a variety of reasons, including:
Battery problems: The battery may not be charging properly, or it could be near the end of its life.
Alternator issues: The alternator is responsible for charging the battery and providing power to the vehicle's electrical system. If it fails, the battery will not be charged and the battery light will come on.
Belt problems: The serpentine belt that drives the alternator may have become loose or damaged, preventing the alternator from functioning properly.
Wiring or connection issues: Loose or corroded wiring or connections can also cause the battery light to come on.
