Hey, My question may sound weird but I've got a friend coming from US and I want him to buy a battery for my MBP (I don't have access to any authorized Apple stores right now.) So here's why I'm asking this question, do Apple Stores sell batteries separately? I searched a lot and didn't find an answer. And if they don't, how should I get an original battery for my MBP? I know there are lots of sellers on eBay and Amazon but can't trust buying third-party batteries. Thanks.