Xiaomi founder and CEO Lei Jun has confirmed that the Xiaomi 18 Fold foldable phone will feature a 6000mAh Xiaomi Sandsjiang battery. This battery uses an innovative stacking technology that achieves a high silicon content of 20% and an energy density of 920Wh/L. This allows the foldable device to maintain a slim profile without sacrificing battery life.
The Xiaomi 18 Fold supports fast charging with 67W wired and 50W wireless charging capabilities. Alongside its battery tech, the device is powered by the new XRING O3 chipset, which Xiaomi markets as the first AI flagship SoC surpassing 5 million points in benchmarks. The CPU employs a ten-core architecture and sets a new multi-core record with a score above 15,000, delivering 60% higher performance than previous generations. GPU performance also jumps, featuring the G2-Ultra NX graphics processor that improves speed by 85% and reduces power consumption by 64%.
Memory technology advances with the introduction of Changxin LPDDR6 RAM, also debuting on the Xiaomi 18 Fold. According to Changxin Technology’s mid-2026 report, LPDDR6 offers a peak data rate of 12,800Mbps with higher capacity options up to 16GB. This RAM generation improves on LPDDR5X through architectural and data transfer optimizations.
HyperOS 4 Launches with Xiaomi 18 Fold
The Xiaomi 18 Fold comes pre-installed with the new Surge HyperOS 4 system. Xiaomi describes this OS as focusing on “efficiency doubling” with a smooth, fluid user experience. HyperOS 4 emphasizes three key upgrades:
- Seamless Basic Experience: The system aims to deliver stability and smoothness, enabling users to complete tasks effortlessly in one go.
- Direct Function Access: Features across the OS and devices improve ease of use and cross-device convenience.
- Integrated AI Ecosystem: Enhanced full-scenario AI collaboration across apps and devices to fulfill user needs fluidly.
HyperOS 4 has been opened for user recruitment since August 13, covering devices like Xiaomi 17 and REDMI K90 series. Xiaomi’s official statements confirm the OS targets a consistent and fluid experience with cross-device AI capabilities.
Technical Highlights and Availability
The Xiaomi 18 Fold’s combination of a high-density battery, flagship-chipset performance, next-generation LPDDR6 memory, and HyperOS 4 positions it as a leading foldable flagship with a focus on power efficiency and AI integration. Charging speeds of 67W wired and 50W wireless complement the large battery for fast refills.
The battery stack design stands out as it balances large capacity with a sleek foldable form factor, addressing a common challenge in foldable devices.
At this time, the Xiaomi 18 Fold has been announced for China. Launch event will be on September 7.
Previous coverage
This follows earlier reports of HyperOS 4’s beta recruitment across flagship Xiaomi and REDMI devices, including the Xiaomi 17 and REDMI K90 series. Unlike those models, the Xiaomi 18 Fold debuts the XRING O3 SoC and LPDDR6 memory, both firsts in the Xiaomi lineup.
