@shamino I'm going to disagree with you; in my opinion that battery does not look soldered in. I believe the metal tab on top of it is kind of a spring contact; the two dimples you can make out are the contact points. Normally I would expect something around the edges of the battery to hold it in place, and it appears there's a cavity on the body of the phone the battery fits into so it'll stay where it belongs, at least in the photo Mayer posted.
Of course the only way to be sure is to take it apart, but that would be my best guess.
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