IIRC the batteries Sony use in "no-user-replaceable-parts-inside-devices" have wires and a plug to fit a header on the mainboard.
What they sell seems to be rather a cellphone or photocamera generic battery. In this case it's expensive. Its design is "replaceable-battery" and I very much doubt someone looking for a Sony battery could use it (if one looks for a Sony battery then he has no knowledge on adapting generic batteries and/or electronics).
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