With smartphones becoming more than just a calling-and-messaging device, their battery life has become an important aspect. On the flipside however, while the phone with a large cell will last long, it’ll also take a considerable time to charge. That’s where fast charging comes in… which promises to juice up the phone quickly. And when we are talking about fast charging, OPPO’s VOOC technology is one of the best in business. It claims to charge up to 75 percent of a typical 2,500mAh battery within just 30 minutes, which is nothing short of impressive. But what exactly is VOOC technology and is it safe? This handy infographic aims to answer all your queries.