{"id":514433,"date":"2026-03-10T05:51:13","date_gmt":"2026-03-10T05:51:13","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/514433\/"},"modified":"2026-03-10T05:51:13","modified_gmt":"2026-03-10T05:51:13","slug":"samsungs-mammoth-20000mah-silicon-carbon-si-c-smartphone-battery-fails-at-960-cycles","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/514433\/","title":{"rendered":"Samsung’s Mammoth 20,000mAh Silicon-Carbon (Si\/C) Smartphone Battery Fails At 960 Cycles"},"content":{"rendered":"

Samsung has remained very conservative in its experimentation in the smartphone battery department ever since the\u00a0Note 7 fiasco back in 2016<\/a>. However, this reluctance is now costing the South Korean behemoth dearly as Chinese OEMs increasingly take the initiative with monster silicon-carbon (Si\/C) batteries.<\/p>\n

Against this relatively challenging backdrop, we reported towards the end of 2025 that Samsung had commenced<\/a> and then abandoned<\/a> its testing of a mammoth 20,000mAh silicon-carbon battery. Well, now we know a lot more about those failed tests as well as Samsung’s ongoing testing of a smaller 18,000mAh battery, courtesy of a few leaked documents.<\/p>\n

Samsung’s experimentation with mammoth silicon-carbon (Si\/C) battery cells continues<\/p>\n

As we noted in a dedicated post recently,\u00a0silicon-carbon (Si\/C) batteries<\/a> 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\u00a0instead of the typical graphite.<\/p>\n

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.<\/p>\n

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. However, as per the leaked tidbits at the time, the South Korean behemoth had quickly abandoned that mammoth cell<\/a> in favor of smaller ones.<\/p>\n

Samsung SDI is testing 12K, 18K mAh Si\/C cells. The 20K failed at 960 cycles. Race is on. \ud83d\udc40<\/p>\n

Full PDF available, Samsung tracking system didn’t work much. Anyways it’s not free. pic.twitter.com\/D8NDy4weNw<\/a><\/p>\n

\u2014 Schr\u00f6dinger (@phonefuturist) March 9, 2026<\/a><\/p>\n

Now, the tipster Schr\u00f6dinger is out with a detailed scoop, disclosing that Samsung’s earlier testing of a 20,000mAh silicon-carbon battery cell failed at 960 cycles. For context, do note that lithium-ion smartphone batteries are typically rated anywhere between 500 and 1,000 charge cycles<\/a> these days.<\/p>\n

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It appears Samsung’s exacting standards wanted to substantially push the envelope on charge cycles for the 20,000mAh Si\/C cell. On the bright side, the South Korean behemoth continues to test a 12,000mAh silicon-carbon battery, consisting of a 6,800mAh and a 5,200mAh cell. It also continues to test an 18,000mAh battery made up of a 6,699mAh cell, a 6,000mAh cell, and a 5,257mAh cell.<\/p>\n

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