Not sure about Apples but PC laptop batteries usually last 1-3 years. Them starting to go bad is normal. At work we have 300 laptops and I have to install about 3 batteries a week so they go bad frequently.
If Apple does allow external resellers to sell batteries for their laptops, I have to recommend not buying batteries online. I've had nothing but bad experiences with it. I only buy batteries from real stores you can walk into, even if it costs more. Being able to return a bad battery > saving a few bucks.
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