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No, “memory effect” really only applies to sintered plate Ni-Cad batteries, which were never used in laptops (old laptops used Ni-Cads, but not that type of Ni-Cad). However, current Lithium Ion batteries can be damaged if they are left completely discharged for more than a few weeks, so you do not want to leave your laptop in that state for long. Also, batteries inherently lose capacity over the course of charge/discharge cycles, so while it is not actually memory effect, you will see degradation in battery performance over time.