Why Do Smartphones Feel Warm When You Charge Them?

When you plug in your smartphone, it starts charging its battery. Think of the battery like a sponge, when you pour water (energy) into it, the sponge gets warm because the water is moving around inside. That’s why your phone feels hot when it charges.

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  1. Your phone feels warm when you charge it because it's like a sponge soaking up water quickly.

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