Thinkpads do that, don't recall since which version but I think my X230 already had it
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So what a cmos battery to save the bios settings or do u mean now battery to reset the settings?
Look, this isn't rocket science. A computer without a battery cannot possibly detect that you've opened the case while powered off (and do something about it like destroy encryption keys).
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Unless there's a big enough capacitor in a chip to destroy internal encryption key, or drain a static nvram hosting it, etc. All possible to circumvent, but you don't need battery - you need some source of current (or in certain conditions, a drain)
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Now, whether the chips involved actually do any of that is another question completely
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