In just two generations, vivo has nearly doubled the battery capacity of its Y-series Pro smartphones. The Y400 Pro, which launched last June, arrived with a 5,500mAh battery, which is pretty average for midrangers these days. The Y500 Pro followed in November with a significant bump up to 7,000mAh, but the freshly announced Y600 Pro makes them both feel tiny thanks to its 10,200mAh Si-C battery.That’s a full 38Wh battery inside a smartphone, and it features fourth-generation silicon anode technology with 15% silicon content and an energy density of 886Wh/L.Judging by the...