Take it to an Apple Genius or Apple Specialist. If you've got a warranty or AppleCare, that should be covered. Usually, batteries are considered "consumables" and are not covered beyond one year (even with AppleCare), but in an instance where the battery is not just showing diminished life, but actually malfunctioning, it should still get covered.
If you've got no warranty, just buy a new battery. Non-warranty replacement of the battery is pretty much pointless, it costs about the same and you get a refurbished battery.
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If you've got no warranty, just buy a new battery. Non-warranty replacement of the battery is pretty much pointless, it costs about the same and you get a refurbished battery.
I'll talk to AppleCare.