Leak: test reports for 12,000mAh and 18,000mAh Silicon-Carbon batteries from Samsung | Infinium-tech
Samsung SDI is testing 12,000mAh, 18,000mAh and 20,000mAh silicon-carbon batteries – internal test reports on the X have been leaked and they show the company still has work to do.
There is no information about the 20,000mAh battery, but reports for the other two say that it failed after 960 charge cycles. That obviously won’t work. The two smaller batteries aim for 1,500 cycles, but whether they can get there is still being tested.
The 12,000mAh battery, SDI-DC12K-SiC-V2, is a dual cell design consisting of a 6,800mAh 4.7mm cell and a 5,200mAh 3.2mm cell. The stack thickness should be less than 9.3 mm (although 2 out of 7 test samples turned out to be thicker).
The 18,000mAh battery, SDI-TC18K-SiC, is a triple cell design: 6,699mAh 4.2mm, then 6,000mAh 3.9mm and 5,257mAh 3.28mm. The target for the stack is about 12.3 mm, but thermal interface layers between cells allowed the test samples to grow to 12.8 mm.
Test report for 12,000mAh and 18,000mAh Si-C batteries from Samsung SDI
According to the test notes, Samsung is looking to redesign the layers between the SDI cells and how they are stacked. It is also working on battery management firmware.
It is estimated that the 12,000mAh battery will provide 20-25 hours of screen time in the phone connected to 4G and Wi-Fi. It has been optimized for stability. Meanwhile, the 18,000mAh battery focuses on high capacity and endurance.
Of course, we’d love to see some of these Si-C cells alone – a 6,800mAh 4.7mm cell or, more likely, a 6,699mAh 4.2mm cell would be perfect for a flagship. Very early rumors claimed that the Galaxy S26 Ultra would use a Si-Si battery, but this apparently did not come to fruition. Maybe Samsung will finish testing the SDI S27 Ultra in time. Naturally, foldables would also benefit from thinner, higher capacity batteries.
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