As many of you know, Samsung is still not using silicon-carbon batteries, unlike its competitors from China. Samsung is testing them, it seems, and we have some information regarding a 20,000mAh battery test that was conducted a couple of months ago.
Before we get to it, some of you may not be familiar with silicon-carbon tech. The main benefit of silicon-carbon batteries is the fact that they pack more capacity in the same form factor as regular lithium batteries. That tech allows the companies to include notably larger batteries in their phones.
For example, the OnePlus 15 includes a 7,300mAh silicon-carbon battery, compared to a 5,000mAh Li-Ion battery in Samsung’s latest flagship, the Galaxy S26 Ultra.
Samsung was testing a 20,000mAh silicon-carbon battery until recently
Samsung is very careful following the Galaxy Note 7 fiasco with exploding batteries, however, and is treading carefully. The company has been testing silicon-carbon batteries, and one such battery is a huge 20,000mAh unit.
Initial reports regarding this surfaced towards the end of last year. The company abandoned those tests since then, and now we know some of the results, thanks to a new report.
That was a dual-cell 20,000mAh silicon-carbon battery, where the primary cell had a 12,000mAh capacity, and a thickness of 6.3mm. The secondary cell offered a capacity of 8,000mAh and a thickness of 4mm.
Samsung seemingly abandoned the testing of such huge batteries for smaller units. According to a tipster, Schrodinger, Samsung’s 20,000mAh silicon-carbon battery failed at 960 cycles. For comparison sake, Li-Ion batteries these days are rated between 500 and 1,000 charge cycles.
The company is still testing 12,000mAh and 18,000mAh silicon-carbon batteries
Samsung continues to test a 12,000mAh battery, it seems, consisting of a 6,800mAh and 5,200mAh cells. The company also continues testing its 18,000mAh silicon-carbon battery made up of 6,699mAh, 6,000mAh, and 5,257mAh cells.
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