There are actually design reasons for not having user replaceable batteries in some cases (not all and Apple is a shocker in some regards). Providing a slot for the user to change batteries around takes space in the case.
Apple love making their gear as slim as possible. So for them, the additional hole in the case and the room required isn't acceptable. That's why their 17" macbooks get good battery life (the battery is huge and doesn't have to be removable). You can get battery packs for iPhones, but yes it's a pain.
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