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Jelly's blog — GNOME battery charge control
(vdwaa.nl)
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Stopping charge at 80% (and still going down near 0%) should give you roughly 4x the cycle life. So in theory doing that it would take about 8 years to hit the same 85% usable level.
85% left after 2.5 years is a high rate of wear, due to phones really pushing as much as they can into the battery to have longer run times.