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原帖由: jimmytvf ,

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I have no previous experience in Macs, but all points the battery. Seems the battery it's somewhere bad with the cells. Inside the battery are some smaller batteries, and when one of them is wrong, it discharges very fast, and it's not providing the electricity the computer needs. The sensor detects that the bad cell is charged, and says its at 31%, but it will drain quick and it will be dead fast. You can search some software about the health of the battery (maybe can check each cell and tell which is bad)

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