memory effect

The term "memory effect" in electronics typically refers to a phenomenon observed in some rechargeable batteries, most notably nickel-cadmium (NiCd) batteries. This effect occurs when a battery is repeatedly recharged after only partial discharge. Over time, the battery may behave as if its capacity has been reduced, holding less charge than it did when new.1

This is because the battery essentially "remembers" the shallow discharge cycle, and its voltage output drops prematurely during subsequent uses. To mitigate this, it's recommended to fully discharge NiCd batteries before recharging them. Other battery types, like lead-acid and nickel-metal hydride, do not exhibit this memory effect.12

In the context of integrated circuits, memory circuits are dense arrays of parallel circuits that use voltage states to store information, such as temporary instructions for a microprocessor. However, this is a different concept from the "memory effect" seen in batteries.3