Samsung refused to jump onto the silicon-carbon (Si/C) battery bandwagon until the technology was truly ready for mass adoption, taking a morally upright stand that cost it dearly, especially in China, where local players have been happy to run with battery capacities as high as 10,000mAh.
Now, however, one tipster believes Samsung has cracked the silicon-carbon battery longevity code, and that the Galaxy S27 will “most likely” ship with such a battery, replete with a much higher capacity than the 5,000mAh level that seems to have become a norm for the South Korean tech giant lately.
For the benefit of those who might not be aware, silicon-carbon (Si/C) batteries differ slightly from conventional lithium-ion ones in their choice of the anode, which is made up of a fracture-resistant, nanostructured silicon-carbon composite material instead of the typical graphite.
So, what’s the catch? Well, a silicon-based anode can hold up to 10x as many lithium ions, essentially increasing the battery’s capacity by orders of magnitude, while allowing for a very slim overall form factor for the battery. On the flip side, these batteries do entail a lower lifespan, especially when compared with their lithium-ion counterparts.
We reported towards the end of 2025 that Samsung SDI was testing a 20,000mAh dual-cell silicon-carbon battery, where the primary cell had a 12,000mAh capacity and a thickness of 6.3mm, while the secondary cell retained a capacity of 8,000mAh and a thickness of 4mm. That cell, however, failed at 960 charge cycles vs. Samsung’s internal target of 1,500 cycles, prompting the South Korean tech giant to start exploring lower capacity cells.
Samsung has also been testing an 18,000mAh cell and a 12,000mAh one, which pairs a 6,800mAh cell (thickness of 4.7mm) with a 5,200mAh cell (3.2mm thickness).
This brings us to the core of today’s topic. The tipster Schrödinger has disclosed in a new blog post that “Samsung’s engineers are actively reworking the separator layers, stacking architecture, and battery management firmware” to extend the longevity of its silicon-carbon batteries to 1,500 charge cycles. The tipster goes on to note:
“Reports from multiple sources point to a Silicon-Carbon smartphone being in active preparation, with the Galaxy S27 Ultra as the most likely first deployment.”
Samsung has largely stayed with 5,000mAh batteries in its smartphones for nearly a decade, with the Galaxy A9 Pro, released all the way back in 2016, constituting one of the first such phones from the South Korean tech behemoth to sport this now-generic capacity. As such, given the amount of time and resources that Samsung has dedicated to its silicon-carbon battery experimentation, one would hope that the consumer-facing debut of this new technology would come with meaningful improvements, and not a repeat of the Galaxy Note 7 saga.
About the author: Writing is my one incontrovertible passion. Over the past six years, he has authored over 2,200 distinct articles on financial and tech-related topics, spanning nearly 1 million words. And he has been a member of Wcctech mobile team since 2025.
As an alumnus of the University of Toronto, Rotman Commerce Program, I bring nuance, in-depth knowledge, and a unique perspective to every topic that I cover.
When I’m not writing, I’m traveling the world, exploring hidden confectionaries and restaurants as an aspiring food connoisseur.
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