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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 40,926
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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It sounds like the machine is being throttled back because it can't "sense" that it's on battery. In other words, the machine thinks the battery is removed. It could also be other causes. Try resetting the System Management Controller first. See this Apple KB LINK. If that doesn't work, make an appointment with your local Apple store to have it looked at.
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