memory effect



  • noun a feature of nickel-cadmium, or NiCad, rechargeable batteries where the battery’s capacity to hold charge is reduced if the battery is recharged before it has been fully discharged. For example if a battery still has half its original charge when it is recharged, it appears only to have the capacity to carry the new half-charge rather than a full charge. It seems, in effect, to have a memory of the last level of its charge.


  • A property of some batteries, especially nickel-cadmium, in which battery life is gradually diminished when recharged before becoming completely discharged. This effect can be minimized by periodically completely draining said batteries.