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Helpful answers
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Oct 9, 2016 6:06 PM in response to Dabmeisterby Carolyn Samit,Hi,
Regarding error PT004:
"The battery requires service. The battery is not functioning normally, though you may not notice a change in its behavior or the amount of charge it holds. You can continue to use your battery before it’s checked without harming your computer."
From here > Apple Diagnostics: Reference codes - Apple Support

