Why phone battery from 90% to 80% last longer than from 10% to 0%

Question

Title… I can use smartphone for a while from 90% to 80% or 80% to 70% but from 20% to 10% or 10% to 0% the time is much shorter.

In: 4

Answer 1

The battery percentage (state of charge) tells you, approximately, how many electrons are stored in the battery. Current is a flow of electrons. Voltage can be interpreted as how much energy each of the electrons has. Power = Voltage x Current. At higher state of charge, battery voltage is higher, meaning, to deliver the same power, less current is required. I.e., at a higher state of charge, each individual electron has more „energy“.