Azokban még "sima" lítium elem volt. https://elektrotanya.com/content/tektronix-tds3012-szoftver-hiba-megoldva-nvram-javitasuj-hattertelep-beepitese

Viszont:

https://gigazine.net/gsc_news/en/20210715-handheld-console-with-tritium-cell/

https://docs.rs-online.com/8128/0900766b810d3285.pdf

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https://citylabs.net/technology-overview/