Consumer electronics devices have been using lithium-ion (Li-ion) batteries for well over a decade now. Very recently, Chinese smartphone makers have switched to a new battery tech: silicon-carbon anode battery. It has enabled foldables to become as slim as bar phones when folded and bar phones to shrink to 6.3″ again, all while packing larger battery than the 6.8″ Galaxy S24 Ultra.
Samsung is finally rumored to switch to this emerging battery technology starting with the Galaxy S26 series next year.
For those unfamiliar, silicon anode batteries pack much higher energy density than traditional Li-ion batteries that smartphone manufacturers have used so far, and this increase in energy density has made it possible for the manufacturers to avoid bulky designs, without hindering the battery life.
Samsung was previously rumored to be working on a different battery tech called “Stacked Battery Technology“, which reportedly improves the energy density by 10%. By applying the stacking process, energy density can be increased by more than 10%. For example, if the battery capacity of the latest Galaxy S Ultra is 5,000mAh, applying stacking could increase it to over 5,500mAh. But now it seems that Samsung has decided to adopt the silicon-carbon battery tech instead.
Galaxy S25 Slim might not benefit from this tech
For those wondering, there is no word on the adoption of such technology for the upcoming Galaxy S25 Slim. According to a recent report, both the S25 Slim and Apple’s iPhone 17 Air will pack batteries with a capacity between 3000 mAh – 4000 mAh.
Samsung’s current Ultra flagship offers an incredible battery life with a 5000mAh capacity. It will be interesting to see how much of an improvement in battery capacity and battery life the Galaxy S26 Ultra manages to offer with the silicon-carbon anode battery tech.
That said, the upcoming Galaxy S25 series devices are rumored to pack the exact same battery capacity as their predecessors. However, the more efficient Snapdragon 8 Elite chipset should make it possible for the devices to offer a slight improvement in battery life as compared to last year’s models.
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