Why does last one last so long?

A simple explanation of why 1\% might last a long time is that the phone has underestimated the current battery capacity. Then when it gets down to what it thinks should be almost empty, displaying 1\%, it finds that the battery has more capacity left than it estimated.

Why do batteries charge faster when empty?

When charging batteries, the cell impedance results in overpotential which raises the cell voltage above the open circuit potential. When cell is discharged (empty) and voltage is low, the overpotential can be increased more with higher current to avoid raising the cell voltage above critical threshold.

Do batteries charge faster in the cold?

Cold batteries hold their charge longer than room temperature batteries; hot batteries don’t hold a charge as well as room temperature or cold batteries. Cold batteries discharge faster than warmer batteries, so if you’re using a cold battery, keep a warm one in reserve.

Why does the last 20\% of a battery take longer to charge?

If you are talking about lithium ion batteries, the last 20\% is slower due to recharge circuitry programming. Initially, the battery is in a constant-current charge sequence where it might be charging at a high rate (a rate that would charge the entire capacity of the battery in 1 hr).

How often do I need to charge my battery?

The first time charging and “wait-until-full-discharge-before-recharge” and “don’t-use-when-charging” are not applicableto these modern batteries. Li-Ion and Li-Polymer batteries, if charged often, after about 1 month, would reach to their maximum performance, and you are recommended to charge them every time you find an outlet!

What happens if you don’t charge the battery properly?

What I can tell you is that there is a solid electrolyte interphase (SEI) which forms upon the first charging cycle. This SEI protects the negative electrode but it is suggested that the SEI leads to fading over time. If you fail to charge the battery fully the first cycle, the SEI will not fully form and may lead to fading over time.

Should I Quick Charge my battery to 100\% or 80\%?

If you try to quick charge them to 100\% charge, they will last only a few charge-discharge cycles before they deteriorate and lose most of their capacity. Doing the quick charge to 80\% and then the slower charge for the remaining 20\% allows a battery to last 500 or more charge-discharge cycles with only a few percent loss of capacity.

https://www.youtube.com/watch?v=Yf9N9zBgyB8