Laptop won't power on without AC adapter

Hello, can someone help me??
I currently using dell inspiron 14R, 5437. I bought it last year and after 11 month using it, i found a major problem. At first my dell cannot charging up the battery, the notif tray says "pluged in not charging". So i use the warranty to fix this, after few weeks they say they ve replacing the battery and AC adapter with the new one.
But after only a few days, yes FEW days.. not even a week another problem occur:
-when the adapter is unplugged, laptop wont power up
-even if it power up, after few minutes it will turned of unexpectedly
-if i plugged in the adapter, laptop works just fine
-if i unplugged the adapter when laptop still on, it will stay turned on
I have trying few tricks like ejecting the battery then press the power button for 30sec, upgrading bios, reinstalling windows, but nothing seems works,,
Now the warranty has expired and i dont know what to do..
should i buy a new battery? Or new adapter? Or perhaps a new laptop?

Sounds like the replacement battery is defective or there is a problem with the system board.  I may be able to help,  I will send you a friend request to get your information, and go from there.
TB

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    I am fully aware of which light you are referring to.
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    Power adapter
    Insufficient power
    Try a different power outlet.
    Replace power adapter.
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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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