A new leak suggests Redmi is working on a phone with an 8500mAh battery capacity. That’s nearly 1000mAh more than the battery on the recently launched Redmi Turbo 4 Pro, which itself packs a sizable 7550mAh cell.
Even more interesting, Redmi is reportedly managing to keep the phone’s body thickness under 8.5mm. For context, many phones with much smaller batteries measure the same, or even thicker. The Galaxy S25 Ultra, for example, is 8.2mm thick and houses a smaller 5,000mAh battery.
The tipster further adds that Redmi’s lab is still fine-tuning its in-house battery tech to maximize capacity without shortening battery lifespan. This jump in battery size is unsurprisingly due to the use of silicon-carbon battery technology, which has seen wider adoption in China this year.
The magic of silicon-carbon batteries
Unlike traditional graphite batteries, which max out at around 372mAh/g, silicon-based materials can theoretically reach up to 4200mAh/g. Silicon also has better lithium storage capabilities, which contributes to higher energy density and better safety during charging. The use of silicon materials helps avoid lithium buildup, which in some cases can lead to short circuits.
Thanks to the shift in materials, phones with 7000mAh or higher battery capacities are now common in the Chinese Android ecosystem. And it might not stop at 8500mAh. In another recent report, the same tipster claimed that 10000mAh phones may arrive as early as next year.
For now, there’s no word on when Redmi’s 8500mAh phone will launch, or what it will be called. We will keep you in the loop as soon as we hear more.
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