Accessory maker QuickerTek has begun selling a new external battery and charger for Mac notebooks. The device is designed for the latest 13-inch MacBooks, and 15-inch MacBook Pros; it is chiefly said to provide between eight and 10 hours of total running time, as compared to the five made possible by Apple's built-in batteries. Internal batteries are depleted before the QuickerTek one takes effe
