It won't reach an equilibrium until the battery charges to 100 %. (gonintendo.com)
Normally it's understood to take many hundreds of years for climate to reach equilibrium after a doubling of CO2. (judithcurry.com)
It would appear the books market has reached an equilibrium of sorts, with about one in three books being a digital one, and the rest being physical books. (telegraph.co.uk)