A charger for portable terminal equipment, capable of distinguishing a nickel-hydride battery pack and a nickel-cadmium battery pack and of detecting an on-hook/off-hook condition even when the nickel-hydride battery pack is used. The charger includes a charging circuit, a pair of third charging terminals...http://www.google.com.au/patents/US5861729?utm_source=gb-gplus-sharePatent US5861729 - Charger for portable terminal equipment having on-hook/off-hook detecting means and battery identifying means
