Samsung is often panned these days for stagnating the battery capacity of its S-series lineup, especially at a time when Chinese OEMs are launching relatively affordable phones, replete with silicon-carbon (Si/C) batteries bearing capacities of up to 10,000mAh.
Yet, a major revamp now appears to be in the offing, as evidenced by Samsung SDI's ongoing testing of a dual-cell 20,000mAh silicon-carbon battery.
Samsung SDI purportedly experimenting with a hefty silicon-carbon (Si/C) battery
As we noted in a dedicated post recently, 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.
To put this into perspective, Apple's iPhone Air is just 6 percent slimmer than the Tecno Pova Slim 5G, but bears a battery that is around 39 percent smaller than Pova's Si/C one.
Now, as per the tidbit shared by @phonefuturist and @SPYGO19726 on X, Samsung SDI is apparently testing a huge dual-cell silicon-carbon battery, where the primary cell has a 12,000mAh capacity and a thickness of 6.3mm, while the secondary cell retains a capacity of 8,000mAh and a thickness of 4mm.
Of course, this battery design remains at an experimental stage right now, as evidenced by the fact that the 8,000mAh cell reportedly swelled by around 80 percent in recent testing.
Given the significant bloating that Samsung's experimental Si/C batteries are still experiencing, a launch in the near-term remains largely out of the question.
And, in the interim, the South Korean giant will continue to receive flak for stubbornly adhering to a ~5,000mAh battery capacity for its flagship smartphones, including the upcoming Galaxy S26 Ultra.
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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