Amongst the types of e-waste, batteries might be most common. Moreover, the might also be the most toxic. They contain metals like cadmium, lead, lithium, and mercury among others. Although their amount in a single battery isn’t much. However, when billion of such batteries find their way into landfills they end causing a huge amount of atmospheric pollution. It’s because they also release greenhouse gases. Furthermore, if they accidentally find their way into the drinking water, they make it poisonous. However, at least when it comes to products like flashlights, an eco-friendly solution is possible. You can always opt for a water-powered flashlight. In fact, you can even make one.