US Patent 9442522 Accessory for wearable computer

An accessory for a wearable computer includes a strap having a cover that covers a plurality of batteries; a first connector that joins a first end of the strap to a first end of the wearable computer; a second connector that joins a second end of the strap to a second end of the wearable computer, the second connector having a housing, and an electrical coupling; and an electronic control unit disposed within the housing, the electronic control unit being electrically connected to the plurality of batteries and being electrically connected to the electrical coupling. The electrical coupling is configured to be electrically connected to the wearable computer, and the batteries supply power to the wearable computer via the electronic control unit and the electrical coupling.