This is undoubtedly one of the most frequent criticisms made of modern smartphones: ever brighter screens, ever more powerful chips, AI functions in the background… and autonomy that struggles to keep up. In this context, the idea of a 20,000 mAh battery is enough to make you dream.
Smartphones that (finally) last several days
Such a capacity could allow you to use your phone for two or even three days without using an electrical outlet, even for sustained use. GPS navigation, streaming video, social networks, photos, games: all this would become less stressful for the user, who would no longer have to monitor their battery percentage from mid-afternoon.
This avenue is all the more interesting as Samsung has remained quite cautious until now. Even the very thin Galaxy S25 Edge still makes do with a classic lithium-ion battery, where some competitors have already started to adopt new chemistries. The change of course, if confirmed, would therefore be notable.
But what is special about this famous silicon-carbon battery? It all comes down to one key component: the anode. In traditional lithium-ion batteries, it is made of graphite. A reliable material, but limited in storage capacity. Silicon carbon replaces some of this graphite with silicon, a material capable of absorbing many more lithium ions. Result: for equivalent size, the battery can store much more energy. We sometimes speak of a theoretical potential up to ten times greater, even if the real gains are more progressive.
The benefit for the user is obvious: more capacity without turning the smartphone into a brick. No need for a thicker or heavier device to gain autonomy. This explains the enthusiasm around this technology, already adopted by certain recent models. The HONOR Win, for example, has a 10,000 mAh battery, a figure that was unimaginable a few years ago.
Samsung would go further with a so-called “double cell” architecture: a first 12,000 mAh battery, supported by a second 8,000 mAh. A modular approach that makes it possible to distribute the load and, ultimately, optimize energy management. There remains one essential point: security. During the tests mentioned by the rumor, the secondary cell would have swollen significantly. However, silicon has a well-known defect: it expands when it charges, which complicates its integration into compact devices.
Samsung is therefore moving forward with caution, and there is no indication that this battery is ready to land in our pockets. The company is already working on silicon-carbon in another context, via a partnership with KGM for batteries intended for electric vehicles. A way to test the technology on a large scale before adapting it to the smartphone.
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