Abstract: A battery pack includes one or more battery cells disposed in a barrier structure that forms a flow channel to direct venting material from a battery cell experiencing a fault condition out of the battery pack in a way that allows expansion of the vented gas before it exits the battery pack. Where two or more battery cells are included in the battery pack, the barrier structure electrically and thermally insulates them from each other so that in the event of a battery cell venting, it will not affect other battery cells and cause a thermal runaway condition.

Abstract: A wireless charger facilitates positioning of a device or devices to be charged by the wireless charger in an optimum location relative to the wireless charger. Some embodiments use physical exclusion features to prevent placement of a device at minimum intensity positions in a charging field. Some embodiments use graphical indicia to indicate the relative charging field strength (or field strength indicators such as charge current, wattage etc.) at various positions so that the user can select an appropriate position. Some embodiments facilitate communication between the wireless charger and the device, where the wireless charger maintains a record of the devices being charged and their positions, in order to recommend a charging position.

Abstract: A dual-contact battery pack comprises a housing, a plurality of battery cells located within the housing, a first set of contacts and a second set of contacts coupled to the housing and to the plurality of battery cells. The dual-contact battery further comprises a first control circuit coupled between the plurality of battery cells and the first set of contacts and a second control circuit coupled between the plurality of battery cells and the second set of contacts. The first and second sets of contacts enable the dual-contact battery pack to selectively switch from a first state which prevents current from flowing from the plurality of battery cells to the respective first and second set of contacts to a second state in which current flows from the plurality of battery cells to the respective first and second set of contacts in response to the respective first and second control circuits.

Abstract: A dual-contact battery pack comprises a housing, a plurality of battery cells located within the housing, a first set of contacts and a second set of contacts coupled to the housing and to the plurality of battery cells. The dual-contact battery further comprises a first control circuit coupled between the plurality of battery cells and the first set of contacts and a second control circuit coupled between the plurality of battery cells and the second set of contacts. The first and second sets of contacts enable the dual-contact battery pack to selectively switch from a first state which prevents current from flowing from the plurality of battery cells to the respective first and second set of contacts to a second state in which current flows from the plurality of battery cells to the respective first and second set of contacts in response to the respective first and second control circuits.