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My 7567 laptop dies when its unpluged

Hi I bought my 7567 late 2017. My problem is laptop works perfectly when its plugged to charger. When I unplug it after a random time it dies without a sign. Then I open it again after some time dies again need to open.. I dont now whats the cause. System diagnostic says that battery is healthy. Any help would be appreciated.

I am using windows 10 pro.

Do not now why it happend could it be a sowtware or a program downloaded to laptop ?

As I was downloading my firmwares from dell website I upgraded all of them succesfully but I could not ugrade my bios It is giving me error how can I fix it

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