Ni-CD batteries may suffer from a memory effect if they are discharged and recharged to the same state of charge hundreds of times. The apparent symptom is that the battery remembers the point in its charge cycle where recharging began and during subsequent use suffers a sudden drop in voltage, as if the battery has been discharged. The capacity of the battery is not actually reduced substantially. Some electronics are designed to withstand this reduced voltage long enough for the voltage to return to normal. This is how cordless phones and two-way radios, for example, are able to use Ni-CD batteries with little impact from the memory effect over a long period of time.