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Charger unplugged however says no batteries detected

My MacBook pro wouldn't turn on for a while till I took then finally it did come on the power adapter shows green light while computer is on. When you unplug the power adapter you expect the computer to shutoff but it does not it stays on and the battery indicated says no batteries available power source battery what is going on do I just need a new battery

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This is sort of a "known issue" - aside from battery swelling I have experienced this when the battery had been cracked.

Someone squeezed something on top of my Macbook Air while it was in a laptop bag in an overhead airline bin. Sometimes I would get the black X in the menu bar and it might run, or it might shut right off, but on a restart or after shutting down for a while it would go away.

Finally, after opening the machine, I found a corner of the battery was cracked. I supposed that moving it (flexing the case) while taking it out or putting it away would cause the issue to appear or disappear.

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