Dec 12, 2013

Do current laptop batteries have “memory effect”?

Is memory effect (where a battery will loose the capacity to take a full charge if consistently charged from a partially discharged state) still an issue I have to be concerned about with current laptop batteries? If so what should I do to avoid it?

More info on memory effect:

"Memory effect, also known as battery effect, lazy battery effect or battery memory, is an effect observed in nickel cadmium and nickel–metal hydride[1] rechargeable batteries that causes them to hold less charge. It describes one very specific situation in which certain NiCd and NiMH batteries gradually lose their maximum energy capacity if they are repeatedly recharged after being only partially discharged. The battery appears to "remember" the smaller capacity.[2] The source of the effect is changes in the characteristics of the underused active materials of the cell.[citation needed] The term is commonly misapplied to almost any case in which a battery appears to hold less charge than was expected. These cases are more likely due to battery age and use, leading to irreversible changes in the cells due to internal short-circuits, loss of electrolyte, or reversal of cells."


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.

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