Eli5: How does a power bank charge a device until it dies, wouldn’t equilibrium be reached?

Question

Eli5: How does a power bank charge a device until it dies, wouldn’t equilibrium be reached?

In: 551

Answer 1

It’s not like connecting two water containers together and letting them equalise. The power bank is essentially pushing electrons into the device, like a delivery driver delivering a package to your door. The delivery driver doesn’t care what you do with the package once it gets into the house – you could open the package now, or you could put it in a room to store it for later. Similarly, the power bank doesn’t care what happens to the electricity when it gets inside the device.