OnePlus and OPPO are rumored to be developing a smartphone with a 7,000mAh battery, potentially setting a new standard for battery size in mainstream phones. This move comes on the heels of the OnePlus Ace 3 Pro, which already boasts a sizable 6,100mAh battery. The use of silicon-based batteries in these devices allows for higher capacity without adding significant bulk or weight, making it a promising development in smartphone technology. Other brands like HONOR and Xiaomi have also embraced silicon-based batteries in their phones, hinting at a trend towards larger batteries in smaller form factors. With the growing demand for longer battery life in smartphones, this innovation could pave the way for a new generation of devices with enhanced power efficiency.