India, Aug. 26 -- The upcoming Oppo F31 series launch in India is expected around September 12 to 14. The new model line will aim at pleasing the users with long battery life and high performance, becoming a serious competitor in the midrange mobile phone market. The series will include three models, including the Oppo F31, F31 Pro and the high-end F31 Pro+, offering an expanded selection between the budget and premium models, with powerful chipset and battery capacities up to 7,000mAh. Oppo remains to show that it belongs to the category of smartphones with large battery capacities. The new F31 lineup will all have a powerful 7,000 mAh battery which comes with 80W fast charging to provide a longer battery life without the extensive recha...