What are the reasons for the sharp decrease in laptop battery capacity?

Question

Batteries

There is a laptop ASUS K43E in a modification with an Intel Pentium B960 processor.
For a year and a half, a full charge of the battery was enough for 4 hours of fairly intensive use: a browser with a dozen tabs, IDE, Wi-Fi, music in the background, a brightness level of 60%.
About a month ago, the charge began to suffice for a maximum of an hour.

cat /sys/class/power_supply/BAT0/energy_full
10868000
cat /sys/class/power_supply/BAT0/energy_full_design 
57200000

Are 5 cells out of 6 dead?

Answer 1

The reason is aging (perhaps accelerated by one-time or periodic "above average" heating) :)
In the near future, meet "mysterious" startup problems that disappear if you start with charging, but WITHOUT a battery connected. At the latest, you will have to replace the battery.

Answer 2

On nix I found that there is a lithium-ion battery.
One and a half to two years of life (since production) is more than.

Answer 3

there is a controller in Akum, approximately it has 2000 charge-discharge cycles, which should be enough for the warranty period of the laptop, and then everyone wants to eat) buy a new one, repacking the batteries will not work because the controller is not changed (