2025 has quietly become the year of absurdly large smartphone batteries. We’ve seen 7,000mAh and 8,000mAh packs becoming mainstream, and Honor even crossed the once-unthinkable 10,000mAh mark.
Nearly all of this progress is from Chinese phone makers who have moved to the use of silicon-carbon battery technology. Samsung and Apple, meanwhile, have been noticeably slower to embrace the shift.
But Samsung may not be content to sit out the big-battery arms race for long.
The big battery race
A tipster claims that Samsung’s SDI division is testing a massive 20,000mAh dual-cell battery for smartphones. And guess what? It’s reportedly based on silicon-carbon technology.
The claimed design uses two cells of unequal size. One cell reportedly packs 12,000mAh into a 6.3mm form factor, while the second measures 4mm thick and adds another 8,000mAh. Combined, the system reaches the headline-grabbing 20,000mAh figure.
What makes this especially interesting is that a single 12,000mAh cell would already surpass the 10,000mAh batteries found in phones like Honor’s Win series. In other words, Samsung may already be testing battery capacities that go beyond what’s currently considered “extreme.”
The tipster claims the full 20,000mAh setup could deliver up to 27 hours of screen-on time and survive roughly 960 charge cycles per year, at least on paper.
However, the battery suffers from longevity issues as it reportedly swelled during the testing. While short-term performance is said to be strong, long-term stability remains unresolved.
Another source adds that the 8,000mAh cell allegedly expanded from 4mm to 7.2mm in thickness after testing, which is a serious red flag for smartphone use.
As always, this information should be taken with a healthy dose of skepticism.
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