- Realme 15000 mAh prototype sets a new record with claims of 5.18 days backup, 50 hours video playback, and nearly 19 hours nonstop recording.
- The upcoming device is teased just before the Realme 828 Fan Festival, where the company is expected to reveal full details and live demos.
- Alongside the giant battery, Realme is also exploring a built-in cooling fan technology that can reduce heat by 6°C, targeting gamers and heavy users.
The Realme 15000 mAh prototype is pushing smartphone battery technology to new extremes. The company has officially confirmed the device just weeks after teasing a model with more than 10,000 mAh. This announcement comes ahead of the Realme 828 Fan Festival, scheduled for August 27, where additional details are anticipated.
Realme 15000 mAh prototype is here and it looks crazy big
What the 15000 mAh means for a phone?
This Realme 15000 mAh prototype is built to stretch battery life in a way that no regular phone does today. The company shared some figures to show what it can handle.
It can run 18.45 hours of nonstop video recording, which is almost a full day of just recording video. For watching content, it promises 50 hours of video playback, which is more than two days straight. For an average user, Realme says it can give 5.18 days on a single charge. If that comes true, then this phone will sit in its own category with no real competition for battery backup.
More than just battery
Along with the battery story, Realme also hinted at another idea. The company teased a phone with a built-in cooling fan. According to them, this small fan can cut down the device heat by about 6°C. For people who play games for hours or use heavy apps, that kind of cooling will make a big difference.
At the moment Realme has not confirmed if this cooling tech is part of the same Realme 15000 mAh prototype or if it is for another separate model.
realme 1x000mAh
— realme Global (@realmeglobal) August 25, 2025
Up to 50 hours of video play on a single charge.
Get comfortable, get immersed.
Free to be "lost in the story." pic.twitter.com/16duFgnQzP
What to expect tomorrow?
The Realme 828 Fan Festival is set for August 27. That is where we will get to see more about this device. We may also get a proper demo of how long the phone actually lasts and if the cooling feature shows up or not. Right now, it is clear that Realme wants to push the limits of what a smartphone can do, at least on battery life.
So the Realme 15000 mAh prototype is not just another phone teaser. If the numbers are real, it will set a new standard in how long a smartphone can run without charging. Many users are tired of carrying power banks, so a phone like this might change the way people look at battery life. We just have to wait for the Fan Festival to see if Realme can back up all these bold claims.

