HT202451: Using and maintaining your Apple MagSafe Adapter
Learn about Using and maintaining your Apple MagSafe Adapter
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Helpful answers
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Nov 4, 2012 11:57 AM in response to mmyorkstonby Cattus Thraex,If under warranty, use it. Causes may vary, from battery (including its controller chip) to motherboard. A banal contact may affect good behavior.
The simplest test is with another charger and/or another battery, if behavior is the same, the problem may be deeper.