eli5 Why does the phone seem to lose battery faster when it’s below 20%?

Question

Is it a psychological thing like how time seems to move faster when you’re late? Or is my phone lying to me?

In: 28

Answer 1

As most have said, it’s difficult to monitor because most newer battery types have a very rapid discharge. Essentially, you don’t know exactly where you are before you drop off the curve.

https://electronics.stackexchange.com/questions/32321/lipoly-battery-when-to-stop-draining