Not long ago, 7,000 mAh batteries were usually associated with big-screen devices like tablets. However, the latest trend in battery tech is the silicon-carbon chemistry, which enables batteries with higher energy density. The latest Oppo A6 Max smartphone features the latest battery technology on board, with its key highlight being the massive 7,000 mAh battery. Battery aside, the A6 Max employs a large 6.8-inch OLED display with a 120Hz refresh rate and advertised 1,600 nits of peak brightness...