A lot of laptops allow for various trickle charging modes. Generally they stay charged between 90 and 100% (charges to 100 then wait until 90), some allow for c

A lot of laptops allow for various trickle charging modes. Generally they stay charged between 90 and 100% (charges to 100 then wait until 90), some allow for charging to 80. In my experience there can be memory effects when fully capping at 80% over the years, though.