You won't believe the capacity of the dual-cell battery Samsung is testing for Galaxy phones
Topping the 10000mAh battery introduced by Honor recently, Samsung hopes to have a massive dual-cell battery for Galaxy phones.
Smartphone battery capacities are getting larger and larger. Honor recently unveiled the WIN and WIN RT gaming phones, and both will sport a 10,000mAh silicon-carbon battery with 100W wired charging. It seems that we are in a new era of higher smartphone batteries. Some of you might remember the early days of touchscreen smartphones when the iPhone was unusual because it didn't have a removable battery. Back then, you could buy extra batteries for a phone like the Motorola DROID, charge them, and carry them with you for a quick change.
Remember when the iPhone was the unusual one for having a non-removable battery?
But Samsung started using non-removable batteries for the Galaxy S series in 2015. LG was one of the last holdouts and switched in 2016 with the LG G5. These days, most phone manufacturers try to get by with enough juice for users to get at least 24 hours between charges. Well, that was the game plan until recently when some manufacturers started pushing the envelope.
For example, the OnePlus 15 features a 7300mAh battery, which was a decent hike from the 6000mAh cell powering the OnePlus 13. What about the battery capacity for the iPhone 14?Well, there was no OnePlus 14 because of tetradecaphobia, fear of the number 14. In China, the number 14 sounds too much like the Chinese word for death and phone manufacturers avoid using the number 14 for this reason. But we digress.
Battery Validation
— Schrödinger (@phonefuturist) December 25, 2025
Samsung SDI dual-cell Si/C battery (20,000mAh).
Cell 1: 12,000mAh @ 6.3mm
Cell 2: 8,000mAh @ 4mm
Results: 27h SOT, ~960 cycles over 1 year.
Post-test: cell swelling detected → longevity failure.
Strong short-term performance. Long stability still unresolved. pic.twitter.com/29Ldb6NJ4x
While the 10000mAh batteries powering the Honor WIN and WIN RT are certainly massive, Samsung is reportedly testing a smartphone battery that makes a capacity of 10000mAh look small. A tweet from a tipster with the ""X" username @phonefuturist says that Samsung is testing a dual-cell Silicon-Carbon (Si-C) battery that adds up to 20,000mAh. One cell delivers 12,000mAh and the other 8,000mAh and the combination used on a smartphone will provide up to 27 hours of screen-on time (SOT). It also will survive 960 charging cycles in a year.
It's back to the lab for Samsung
At least one major issue was discovered after testing. The batteries swelled up. That led @phonefuturist to say that the 20000mAh dual-cell battery showed strong short-term performance although long stability is still unresolved. The 12000mAh cell is 6.3mm thick while the 8000mAh cell is 4mm thick. However, that latter cell, according to a source, swelled up from its original 4mm thickness to 7.2mm after testing. As a result, Samsung will need to go back to the lab to see if it can resolve this problem.
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