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blankyao 这有个文章可以拿给Apple Store看，主要是说：至少300cycle后，Apple的电池是可以保存80%的原能力，300cycles 之后就不考虑是硬件问题，你的才92cycles,怎么可说是自然损坏？
A properly maintained Mac notebook computer battery is designed to retain at least 80% of its original Full Charge Capacity for 300, 500, or 1000 discharge cycles (the number of cycles will vary depending on the computer model). After 300, 500, or 1000 discharge cycles, a battery is considered depleted and battery performance is no longer a reliable indicator of a defect.
http://support.apple.com/kb/HT3557好，现在问题是你已经担保期过了，这里的文章谈到，担保期后有硬件问题一年内还可换：
Apple will provide a warranty against hardware defects on the replacement battery for one year from the date of the Out of Warranty service.
http://www.apple.com/support/macbookpro/service/battery/这些都是Apple的文章，觉得你完全可以免费换，问题是那块电池在哪？如找不到，就打印这个贴子可证明那是个92Cycle的电池。