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I don't think that's normal. I have an old cheap Lenovo from 2012 that sees 4-12 hours of active use daily. It's almost always plugged in without any limits on the battery charge (which as a result is always at 100%). The battery still has around ¾ of the original capacity (it ran for ~4 hrs of light use back in 2012, and gives around 3 hours now).