Anker Launches Smaller & More Efficient Second-Gen GaN Chargers Advertisement Advertisement Anker has launched the second-gen models of its GaN (gallium nitride) chargers. The new Anker GaN Nano II chargers are smaller in size and are more efficient as well. The company says it managed to achieve those upgrades by using what it calls “GaN II” technology. It is essentially the company’s second-generation version of the gallium nitride-based components. The new chargers feature a more compact stacked design with an upgraded circuit board structure that enables higher energy efficiency. According to Anker, the upgraded technology could offer up to a 20 percent increase in working efficiency. This means the second-gen GaN chargers generate less heat and are smaller than the first-gen models.