Eli5: What happens when you use a powerful charger on a smaller device?

Question

I plugged my phone into my laptop charger to see what would happen. My phone on 10% said “charge time 2 mins”. But then after a bit it changed to 45mins.

Does the phone somehow change the power of the charger to a more sensible power?

My phone has a fast charger which is usually “1hr” to fully charge.

In: 5

Answer 1

First, to make sure you do not damage anything.
Your charge may not have higher voltage than 5V, and positive and negative has to be in the same way.

Ampere can be as high it wants to, as long it is as high or higher than what your phone demands-