All of the projects that you have made so far have used coin cell batteries for their power source. But once those batteries run out, you’ll have to dispose of them somehow. Usually that means recycling them or throwing them away, which is not a sustainable way to power your projects because the batteries contain dangerous metals that can get released into the environment.
A better solution is to use a solar panel for power. Because solar panels use renewable energy from the sun, they don’t run out of electrical charge like batteries, so you don’t have to recycle them or throw them away. In this ...
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