Chinese automaker BYD unveiled a new battery pack Thursday that the company says is capable of charging from 10% to 70% in five minutes. Taking it to almost 100% takes about four minutes more. Recharge times like those would nullify concerns about electric vehicles’ charging times — one of the few places where internal combustion engines retain an advantage. Even in bitter cold weather (–4°F or –20°C), the pack can charge from 20% to 97% in under 12 minutes, according to BYD. The battery pack, known as the Blade Battery 2.0 system, is slated to debut in the Yangwang U7, a full-size luxury sedan. There is a critical caveat to this eye-popping figure. The Yangwang U7 sedan, or any other future BYD vehicle equipped with this next-generation battery pack, can only reach this ultra-fast charging time when paired with one of the company’s new Flash Charging EV chargers, which is capable of delivering 1.5 megawatts of electricity.…