Patent ID: 6081096
Filing Date: 2000-06-27
Classification: G06F,H02J,H04B

Abstract:
An electronic device comprising:a charger to generate a charging current;a first contact to couple to a first battery;a second contact to couple to a second battery;a third contact to couple to the first battery, the third contact to communicate a first voltage level when the first battery is attached thereto;a fourth contact to couple to the second battery, the fourth contact to communicate a second voltage level when the second battery is present;a first switch comprising a first output, a second output and an input, the first output coupled to the first contact, the second output coupled to the second contact, and the input coupled to the charger, the first switch to selectively couple the input to one of the first output to supply the charging current to the first contact and the second output to supply the charging current to the second contact;a second switch coupled to the third contact and the fourth contact; anda controller coupled to the first switch and the second switch, the controller to control the second switch to couple one of the third contact to the controller to determine presence of the first battery from detection of the first voltage level and the fourth contact to the controller to determine presence of the second battery from detection of the second voltage level.