A universal battery charger for cellular telephones and other battery operated devices. It also may be used to power a battery operated device when there are no batteries in the device. It can charge a battery from power sources having different voltages (e.g., a 12 volt car cigarette lighter, or a 110...http://www.google.de/patents/US6956353?utm_source=gb-gplus-sharePatent US6956353 - Universal battery charger for cellular telephones and other battery operated devices
