My question battery is bad?

Hello, since my notebook Acer AS11B5E,17 “the screen has fallen, I do not look at the demonstration nearly, if I connect it the exterior monitor, all demonstrated that I carry on me through each method to know (FN + F8, from control panel hand regulation) futile effort, integrates on display monitor's darkness, I am waiting for in this aspect advantages opinion, if my question battery is bad
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  1. Notebook screen stays dark. External/exterior monitor also does not work.

    Shine flashlight or hold screen near bright light. Can you see dim display?

    If no, probable cause is failed graphics chip on motherboard.
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