| Memory effect | Memory effect happens in NiCad and NiMH batteries when crystals build up on the electrodes and decrease the active surface area that gets charged (wikipedia.com) . This happens when batteries do not get fully discharged before they are recharged. NiCad batteries should always be fully discharged before they are recharged because they suffer more from "memory effect" than NiMH so. Lithium Ion batteries do not suffer from memory effect.
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