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Try a known-good battery, maybe a friend's?
If there's no difference, even with a different battery (or you don't have access to another battery), then most likely you have a failed battery connector, or possible the mag-safe connector board (the internal part where your power adapter plugs in.) A trip to an Apple service shop will sort this out. Either of those parts are inexpensive (maybe about $20), and not too difficult to replace. Unless your battery needs replacing, a repair may be less than $100
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Serendipity is a lucky guess !
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