https://www.google.com/search?q=battery+in+calculator&biw=1366&bih=657&source=lnms&tbm=isch&sa=X&ei=W87oVPWZEcezggS3xYLQCg&ved=0CAcQ_AUoAg#tbm=isch&q=ti+84+silver+spiral+battery&imgdii=_&imgrc=c-20UxiJqn10SM%253A%3B8YzAuhN8xRbmXM%3Bhttps%253A%252F%252Fd3nevzfk7ii3be.cloudfront.net%252Figi%252FC1uSSVpUE1XRBhiq.medium%3Bhttps%253A%252F%252Fwww.ifixit.com%252FGuide%252FTI-84%252BPlus%252BSilver%252BEdition%252BMotherboard%252Band%252BScreen%252BReplacement%252F19486%3B592%3B444 It's the same thing on a calculator, what are the silver metal spiral things on each side of the battery?

It's a spring to hold the battery tight against the contacts.

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