World's Fastest Charger-Powered Smartphones in Under 5 Minutes

Researchers have showcased the world's fastest smartphone battery-charging technology, which can fully power a phone in less than five minutes. Developed by the Chinese consumer electronics company Realme, the new 320-watt fast-charging technology, dubbed "320W SuperSonic Charge," now surpasses the previous record set by Xiaomi's subsidiary, Redmi, whose 300W charger reached full charge in 4 minutes and 55 seconds in early 2023.

At the Realme 828 Fanfest in Shenzhen, China on August 14, Realme representatives demonstrated this record-breaking technology. It can charge a smartphone battery to 26% in one minute and to 50% in less than two minutes, with a full charge taking only 4 minutes and 30 seconds, as reported by GSMArena. Unlike traditional charging, which powers a single cell or multiple cells in sequence, this fast-charging technology simultaneously charges multiple cells within a single battery.

During the demo, a folded battery design with a 4,420 milliampere-hour capacity was used. This design stacks four cells on top of each other, providing a 10% higher capacity compared to conventional designs. Researchers miniaturized each cell into layered structures to fit more charging power into less space before folding them in a fashion similar to satellite panels, as shown in an online video.

Additionally, Realme has developed a power adapter called "Pocket Cannon." Despite its compact size, the adapter boasts a power density of 3.3 watts per cubic centimeter and can charge various devices, including iPhones with USB-C ports, though perhaps not as fast as the new Realme technology allows. Last year’s 240W charger utilized an adapter with a power density of 2.34 watts per cubic centimeter and could charge the Realme GT Neo 5 smartphone in under 10 minutes.

The new adapter is compatible with multiple fast-charging standards, such as UFCS, PD, and SuperVOOC, and includes two USB-C ports allowing simultaneous charging of two devices. Maximum output is 150 watts for Realme smartphones and 65 watts for compatible laptops.

To ensure safety, the company also introduced the "AirGap" voltage transformer. This device helps isolate high voltages from smartphone batteries during electrical issues like circuit breakdowns, reducing risk and protecting the smartphone by performing contact-free electromagnetic conversion. The transformer lowers voltage to 20 volts, maintaining a 93% power efficiency while safeguarding battery life.

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