The Chinese smartphone manufacturer has said that the concept phone would be discussed at the Realme828 Fan Festival.
The whopper 15,000mAh battery, charged with a 320W charger, is equivalent to 25 movies back-to-back, 30 hours of non-stop gaming, or 5 days idle.
The powerful Realme phone could be used as a power bank for various devices too.
The Realme phone's cooling fan with a special air vent could cool it down by 6°C, making it suitable for prolonged gaming, streaming, or other battery-intensive applications.
The Realme device is shown in a concept video posted on X with a greyish semi-transparent back panel, a slim profile, and dual cameras.
Realme's concept posts come amid Chinese brands experimenting with battery capacities. Realme's biggest battery in a phone so far will be the 7000mAh in the Realme 15T.
Realme is currently gearing up for the release of the 15T on September 2 this year.
Although it is not clear when—or if—this phone can become a reality, but if it did, it would be a game-changer, staying unrivalled until other phones entered the fray.