My Macbook Pro battery cannot be detected.

Hey guys, my mac wont' detect the battery and cannot be turned on unless it's plugged in. What should I do?

sandraibrahim3,
plug in your MacBook Pro, start it up, log in, open System Information, and select ▼ Hardware → Power on the left-hand side of its window. What data are shown in the Battery Information section on the right-hand side of its window?

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