Macbook Pro Battery Replacement

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Battery is dead.

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Successfully replaced the battery with a new one.

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Don't be too quick to come to a conclusion of the battery is dead when you realized that the battery is not charging at the MacOS desktop. After I changed the battery with a new one the status remained the same. Which I then realized al the while, it was the charging curcuit of the mainboard failed.

The tell-tale sign that the charging curcuit having issue is when you noticed the Macsafe cable charging light is not turning on.