After a long time of users asking, Valve has actually added an official Battery Charge Limit setting in the latest Steam Deck Beta update so you no longer need to use third-party tools.
Consider two decreasing lines, one with a slightly lower slope. Now imagine the steeper line starting higher on this graph, eventually the lines will cross and despite starting lower the shallower line will be higher.
But this 80% will last a lot longer.
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Consider two decreasing lines, one with a slightly lower slope. Now imagine the steeper line starting higher on this graph, eventually the lines will cross and despite starting lower the shallower line will be higher.
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… do you know how batteries work? Or how they degrade?
I mean, 80% corresponding to X mAh battery capacity. It will stay at that value for much longer.