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Just replaced dead battery on MacBook Pro Late 2011, and it is seen by OS (el Captain) and charging OK.

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Though, processor speed is still being cut and ticks only at 0.8 ghz and Apple Hardware test shows 4xxx error with the battery.

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Did reset to all that possible, any ideas how to make Macbook see battery on a hardware level?

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Resolved by using an original battery.

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