| 主权项 |
1. An apparatus comprising:
a cover for a mobile device; an autobalancing circuit attached to the cover, wherein the autobalancing circuit is configured to be electrically connected to a first battery and a second battery, wherein the second battery is attached to the cover, and wherein the autobalancing circuit is configured to determine voltage difference Vbat1−Vbat2 between the output voltage of the first battery Vbat1 and the output voltage of the second battery Vbat2, and if the voltage difference Vbat1−Vbat2 is higher than a predetermined limiting voltage, the autobalancing circuit is configured to limit balancing current between the first battery and the second battery until the output voltage difference Vbat1−Vbat2 between the first battery and the second battery is less than the predetermined limiting voltage. |
