How good are reconditioned laptop batteries?

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I've seen ads and auction listings for "reconditioned batteries" for
laptop and notebook computers. If you've tried a rejuvinated battery,
please post your experience, bad or good. Also, any recommendations,
as to whether to buy a "new", "used", "refurbished", or
"reconditioned" batteries.

Too many choices, perhaps? Is there a "dollar store" that sells
reconditioned/rejuvinated cel phone or notebook batteries?

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