Patent ID: 9263903
Filing Date: 2016-02-16
CPC Classification: H02J,H04R

Claim Text:
1. A method, comprising: grounding a first terminal of a battery inserted in a charger; sensing a bipolar voltage from a second terminal of the battery; converting the bipolar voltage to a reduced unipolar voltage for sensing by an input to a microcontroller and converted to provide an indication of battery polarity; controlling a switch state of a low resistance analog switch using an output from the microcontroller, wherein the low resistance analog switch connects the battery to a charging circuit, and wherein the switch state is controlled to present the proper battery polarity to the charging circuit based on the unipolar voltage, and wherein the microcontroller is configured to use the unipolar voltage to determine if the battery has been removed or if charging is completed; and charging the battery using the charging circuit.