Chosen Solution
Everything looks very straight forward. I’ve watched several videos on replacing the battery but my question is “what are the two thin plastic things for”? I’m not talking about the guitar pick looking things but the long things. There are two of them attached together that look like they peel apart. (see photo)
I’ve not seen them used in any video.
Those guitar pick looking things are actually the adhesives that you place under the battery so it stays in place. You place them under the battery first.