I don't know what is the problem..
Oneday, after my previous study breaks, for I go to my home, remove a chromebooks charger.
But after that, chromebook suddenly goes out..
So I pick up the charger again, fortunately, chromebook is recharge, but system is reboot..
After that, chromebook is not booted before picking up the charger,
and recently battery marking in the chromebook is smoothly down..
How to repair that?..