Panasonic recently began mass producing high-capacity 3.1Ah lithium ion batteries for notebook computers that are noteworthy for their higher levels of safety and high capacity. The design, known as 18650, has an insulating metal oxide layer between the positive and negative electrodes Panasonic calls Heat Resistance Layer that adds no added bulk to the battery but prevents the battery from overheating and catching fire, even if a short circuit occurs.
