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That makes no sense, a battery is a battery. If it doesn't lose capacity by letting it drain to ~0% on a Apple laptop, it's not going to lose capacity when drained from a x86 laptop.
By that logic, if I ran Linux on a Powerbook, I'd lose capacity if I let it drain below 20%, but then it'd regain that lost capacity if I boot into Mac OS X.
And, yes, the battery technology is similar in Apple laptops ( http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/718... )
and x86 laptops ( http://accessories.us.dell.com/sna/productdetail.aspx?sku=312-3280&... ).