it is normal if always plug in the supply without take out the battery.
My notebook battery can use up to 3 years (Asus) but battery must be discharged to 9% then plug in power and must fully charged to 100% then take out.  when using at home or office, alwasys take out the battery and plug in power.

TOP

有冇其他野壞 - should be no problem as the program show up the battery life only have 28%, so shunt down is normal, it will suddenly shunt down but other hardware should be still ok.

TOP