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 voltage of a lithium ion battery at first drops slowly as it is discharged, and then this speeds up lot as it approaches 0%. Maybe the phone is measuring battery level based on voltage, and isn’t taking this into accoount.