How to fix “Plugged in not charging” problem in laptops, FUJITSU FMVNBP221 4-cell laptop batteries for FPCBP374, Stylistic Q702, LifeBook Q702

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How to fix “Plugged in not charging” problem in laptops? i have a Laptop: Fujitsu Stylistic Q702 notebook ,and recently it show some terrible issue i cannot solve,How to fix “Plugged in not charging” ...