Not long ago, Honor launched the X70, the mainstream smartphone with the biggest battery so far at 8,300 mAh. As it turns out, vivo (or its sub-brand iQOO) is currently working on a device with not quite the same capacity, but one that’s not further off either at 8,000 mAh. This handset with the model number V2507A is already certified for sale in China by the relevant authorities, which is how we know about that battery size. And today it’s been spotted in the Geekbench online datab...