For charging a storage battery, e.g. a nickel-cadmium cell, recharging is conducted after the battery is forcibly discharged while the charge voltage stays in a specified range after a period of time from the start of the charging action. Accordingly, the generation of memory effect will be avoided....http://www.google.fr/patents/US5475294?utm_source=gb-gplus-shareBrevet US5475294 - Charge controller for battery charger
