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Depends on the model, for T420/T430/W420/W430/X220/X230 there is this:

https://hackaday.com/2020/09/02/building-an-open-source-thin...

https://beta.aceparent.me#/battery




Thank you for the links! By the way there is a follow-up: https://beta.aceparent.me/#/battery2

And the related HN discussion: https://news.ycombinator.com/item?id=24319839




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