Tech lovers, get ready! realme has just droped away the jaws of smartphone industry by its realme 15000mAh battery phone and futuristic Chill Fan phone at the 828 Fan Festival 2025. The two concept devices represent extremes in smartphone design, battery life and cooling technology.
Slim body housing a 15,000mAh battery
The most interesting part of the showcase was the realme 15000mAh battery phone. This smartphone features a huge battery but is quite slim, measuring just 8.89mm thick–unlike the power banks that are as bulky as brick. According to realme, the phone is 42% thinner and 68% lighter compared to a power bank of similar capacity.
Due to the high energy density of 1200Wh/L through the usage of advanced silicon content anode battery technology, realme 15000mAh battery phone achieves this feat while maintaining a compact design as good as the industry level through re-engineering of the main board which reaches a record-breaking thickness of 23.4mm. Advanced lamination is also applied to the battery so that its thickness is only 6.48mm, which is within the range of available space inside the phone.
Incredible battery life claims
The realme 15000mAh battery phone claims impressive stamina, as stated by realme:
- Up to 18.45 hours of continuous video recording
- 30 hours of gaming
- 50 hours of video playback
- A single charge lasts for 5.18 days usage
- Standby time 3 months in airplane mode
Well, these numbers alone can undoubtedly fulfil the dream of a gamer, a vlogger or any heavy smartphone user as seen in the example above making the realme 15000mAh battery phone attractive on paper.
Hardware and performance
The realme 15000mAh battery cellphone offers much more than only power. The device carries a 6.7-inch OLED, MediaTek Dimensity 7300 SoC, 12GB RAM, and 256GB memory. Even with such a big battery, it also supports 80W SuperVOOC fast charging.
It also comes after realme unveiled a concept phone in the 10,000mAh space earlier this month, suggesting a commercial counterpart might not be far away either. The 10,000mAh version is reportedly set to hit stores by 2026.
World’s first “AC phone”: realme Chill Fan
Besides the battery beast, realme also announced its second innovative concept – a realme Chill Fan phone. Advertised as the first “AC phone” in the world, it combines TEC (Thermo-Electric Cooling) with a semiconductor system that brings the core temperature down by up to 6º C—two to three times more efficient than conventional cooling solutions.
In the extreme scenario, the IceSense Ultra design changes the color of the back panel from white to blue while cooling temperatures from 45º C to 38º C and achieved up to 6.2º C colder temperatures in game tests, notably in a popular anime strategy game, to ensure smoother game playing.
Future availability
Even though the realme 15000mAh battery phone is a concept right now, it is a step in the right direction and sets the goal of making smartphones slimmer while also allowing them to last well over a week on a single charge. Although we likely have a way to go before the Chill Fan phone is ready for mass-production, the innovation from realme is undoubtedly a little glimpse into the next-gen smartphone you may be targeting all right away.
FAQ
Flaunting the design of an 8.89mm body, the realme 15000mAh battery phone promises a larger battery life of 5 days and a 3-month standby.
It employs a semiconductor chip for thermoelectric cooling to lower core temperature by 6º C, making it the first “AC phone in the world.
It is a concept right now but there are reports indicating that a 10,000mAh version will hit us in 2026.
