Oppo could be gearing up to launch a smartphone with a massive 12,000mAh battery. An upcoming Oppo device, featuring the large-capacity cell, has reportedly received certification from China's Ministry of Industry and Information Technology (MIIT).According to the source, an Oppo smartphone bearing the model number PNC110 has received the MIIT approval in China.While the listing does not explicitly mention a 12,000mAh battery, its metadata reveals that the device packs an 11,460mAh cell, which could be marketed as a 12,000mAh battery.No other details about the phone have...