Imagine a powerful smartphone with a battery capacity so large that you have to charge the device just once a week. According to reliable tipster Digital Chat Station, Honor, the phone manufacturer owned by a consortium made up of more than 30 Chinese electronics firms, is testing a smartphone powered by a battery with a massive 14,000–15,000 mAh capacity.
Samsung used silicon-carbon tech to power its 2026 foldable models
Currently, the Honor Win RT2 gaming-focused flagship is powered by a 12,070 mAh silicon-carbon battery, which is thinner than the traditional Lithium-ion batteries still used by Apple and Google. Samsung used lithium-ion cells for the Galaxy S26 flagship line, but used silicon-carbon battery technology for its 2026 foldable models such as the Galaxy Z Fold 8 and the Galaxy Z Flip 8. These batteries incorporate silicon into the carbon anode (the negative electrode in a rechargeable lithium-ion battery).
The silicon-carbon batteries feature much higher energy density, which allows Samsung to increase the capacity of the batteries powering its 2026 foldables while keeping these models thin and light. For example, the aforementioned Honor Win RT2, despite its massive battery capacity, is only 8.5 mm thick. By the way, that huge 12,070 mAh battery on the latter device will fast-charge at 900 W.
Honor's WIN RT2 gaming phone sports a battery with a capacity above 12,000 mAh. | Image by eBay
Digital Chat Station believes that the new model being tested by Honor might end up available only in China. This is the second wave of major battery improvements that started in China. The first wave featured faster charging speeds that can fully charge a battery in 10-15 minutes.
In the US, the OnePlus 15 offers the fastest charging speed with its 100W SuperVOOC setup. Other manufacturers that dominate the US smartphone market, like Apple and Samsung, remain conservative when it comes to extreme charging for fear that using such technology will reduce the lifespan of the cell powering a handset. The second wave is the use of larger batteries. This wave, similar to the first one, has yet to find much traction in the US.
Apple, Samsung, and Google will eventually use 10,000 mAh batteries on their flagship phones
Apple continues to raise the capacity of the batteries used to power the iPhone, and Samsung is expected to finally end the use of 5,000 mAh batteries for the Galaxy S Ultra line by installing a 5,700 mAh cell to power next year's Galaxy S27 Ultra.
Nonetheless, the really powerful batteries with five-digit capacity figures have yet to be seen that much outside of China, except on specialized "rugged" phones. Eventually, we will see 10,000 mAh batteries powering iPhone handsets, and flagship Galaxy and Pixel phones. This could come sooner than you might think.
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Alan, an ardent smartphone enthusiast and a veteran writer at PhoneArena since 2009, has witnessed and chronicled the transformative years of mobile technology. Owning iconic phones from the original iPhone to the iPhone 15 Pro Max, he has seen smartphones evolve into a global phenomenon. Beyond smartphones, Alan has covered the emergence of tablets, smartwatches, and smart speakers.
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