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A recent leak claims Samsung SDI is experimenting with a jaw-dropping 20,000mAh silicon–carbon battery. If true, the technology would far outstrip current smartphone standards — but the rumor comes with big caveats, including swelling and questionable source reliability.
What the leak actually says
According to the tip, the pack is a dual-cell silicon–carbon setup: a 12,000mAh cell at 6.3mm thick paired with an 8,000mAh cell measuring 4mm. Combined, that totals 20,000mAh — four times the capacity of many modern flagship phones.
- Configuration: Dual-cell silicon–carbon
- Cells: 12,000mAh (6.3mm) + 8,000mAh (4mm)
- Tested runtime: ~27 hours of screen-on time (SoT)
- Estimated durability during tests: ~960 full charge cycles per year
Impressive numbers — and red flags
On paper, 27 hours of SoT and nearly a thousand cycles sound transformative. Imagine using a phone for days between charges — a tempting prospect for travelers and power users.
But testers reportedly saw swelling issues shortly after trials ended. One follow-up claim says the 8,000mAh cell expanded from 4mm to 7.2mm in thickness. Swelling is a serious reliability and safety concern; it can damage devices and indicate unstable chemistry or packaging.
Is this meant for phones or EVs?
Context matters. Samsung isn’t typically the company pushing extreme battery capacities in its smartphones — the Galaxy S25 Ultra, for example, uses a 5,000mAh cell. That, combined with the unusual scale of this pack, leads analysts to suggest the test could be aimed at electric vehicles or other large-format applications rather than handsets.
Why you should stay skeptical
There are three big reasons to treat this rumor cautiously:
- Source reliability: The information comes from a tipster with a mixed track record.
- Safety concerns: Reported swelling undermines any near-term commercial prospects.
- Practicality: Fitting a 20,000mAh dual-cell pack into a smartphone while meeting weight, thickness, and regulatory requirements is a huge engineering challenge.
In short, the idea of a 20,000mAh silicon–carbon phone battery is exciting — but it’s more likely an experimental prototype or an EV-focused cell. Keep an eye on official releases from Samsung SDI and Samsung Electronics before you expect this kind of capacity in a pocketable device.
Source: gsmarena
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