The simplest and most direct way is to see if there is Tough Solar in English on the front or back of the dial. Tough Solar means solar energy. The dial of a regular quartz electronic watch has the words QUARTZ on it.
It is true that some counterfeit or high-defense imitation watches are deliberately printed with the words Eco-Drive to pass them off. In this case, you can only open the back cover to check the battery and. movement. Photokinetic energy watches use long-lasting rechargeable batteries (lifespan can be up to about 15-20 years), and there is also an amorphous solar cell that can convert various light energies into electrical energy. Quartz watches only use common silver oxide button cells, which are very different in appearance.