#battery innovation

Samsung SDI is reportedly testing a massive dual-cell silicon-carbon (Si/C) battery with a combined capacity of 20,000mAh, signaling early efforts to dramatically increase battery sizes for future smartphones and portable devices. According to information shared by industry tipsters, the experimental battery design consists of two cells: a primary 12,000mAh cell measuring about 6.3mm thick, and a secondary 8,000mAh cell with a thickness of roughly 4mm. This allows the anode to store significantly more lithium ions potentially up to ten times more, enabling much higher energy density without drastically increasing battery size. Because of these issues, the dual-cell 20,000mAh battery remains firmly in the experimental stage, with no clear timeline for commercial use. As a result, Samsung is expected to continue using conventional lithium-ion batteries for its near-term flagship devices, including the upcoming Galaxy S26 Ultra, which is still rumored to retain a battery capacity of around 5,000mAh. While the test underscores Samsung SDI’s long-term ambitions in next-generation battery technology, significant engineering hurdles remain before such high-capacity silicon-carbon batteries can safely reach consumer smartphones. This particular model looks like a large AA battery with a curved mid-section. The ports are found at one end of the battery -- a micro-USB port for charging the battery itself and a regular USB port for charging any other device from the battery. Read more in our articles including "Samsung SDI Tests Experimental 20,000mAh Silicon-Carbon Battery for Future Devices" and "BPI to remove InstaPay, PESONet transfer fees starting July 1".