While leading phones are moving towards adopting silicon and carbon batteries with capacities exceeding 7,000 mAh, the Samsung Galaxy S26 Ultra is still limited to a battery with a capacity of only 5,000 mAh. Despite this apparent lag in the current numbers, recent reports revealed that Samsung has already begun testing a group of advanced silicon-based batteries to turn the tide in the market.
Leaked documents indicate that the successor to the Galaxy S26 Ultra may come equipped with a much larger battery than previous generations. These leaks confirm that the company is currently conducting extensive tests on several models of silicon and carbon batteries, as it is said that the largest model among the test units is a huge battery with a capacity of 20,000 mAh, but it was subjected to a technical defect after completing only 960 charging cycles.
Samsung is also conducting rigorous tests on an 18,000 mAh battery consisting of three cells stacked on top of each other. This battery combines a cell with a capacity of 6699 mAh, a cell with a capacity of 6000 mAh, and another with a capacity of 5527 mAh, bringing the total thickness to 12.8 mm, making it an ideal choice for phones intended for heavy-duty use, while the battery with a capacity of 12,000 mAh with a thickness of 9.3 mm seems a more realistic option for regular smartphones.
The company expects the 12,000 mAh battery to withstand about 1,500 charging cycles before its actual capacity drops to 80% of its original state. This huge capacity is supposed to be sufficient to provide between 20 to 25 hours of active and continuous use in the smartphone, and given that the operating time and life cycle tests are still continuing in the company’s laboratories, these promising numbers remain within the range of theoretical expectations until further notice.
Although these test batteries are still very thick and do not fit into the slim designs of most current Galaxy series phones, the leaked documents prove that Samsung is actively working to develop its silicon and carbon battery technology. These ongoing efforts indicate that the major technology company may be able in the near future to offer smart devices with battery capacities that strongly compete with those found in leading Chinese models to meet the aspirations of users.
