system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how exactly does battery "give power" to a smartphone or laptop? What magic does electricity do to a battery?
gpt
A battery sort of burns some substance, very slowly, in a way that makes the energy come out in electricity, instead of heat.

The basic idea is that you make the chemical reactions happen in two steps, one of which happens at one side, and the other happens at the other side. One reaction needs an electron, which is a particle that has an electric charge, and the other reaction releases an electron. This means that the first step pulls electrons from the first side, leaving it with a positive charge, and the second step releases electrons to the other side, making for a negative charge. And if you have too many electrons in one place, and not enough in another, then you can connect a circuit, like a light bulb or a phone, between the two places, and electrons will be forced through the circuit - and we call this electricity.