Samsung will finally give the Galaxy S27 Ultra something that users have been dying for
At long last, Samsung is making an important change to a component inside the Galaxy S27 Ultra.
The Galaxy S27 Ultra rumored to get a long-desired change | Image by Samsung
The Samsung Galaxy S27 Ultra is going to surprise some fans of the Ultra series, at least when it comes to battery life. According to a 3C regulatory listing posted by China's 3C (China Compulsory Certification), the top-of-the-line 2027 Galaxy flagship will be powered by a 5700mAh battery. This would be the first time that Samsung has moved off of the 5000mAh capacity battery for an Ultra handset.
Samsung has never increased the battery capacity of its Galaxy S Ultra phones
That is not to say that battery life didn't get better over the years. Optimizing the processor helped and process shrink reduced the size of the transistors in these chips increasing transistor density. This led to not only more powerful chipsets, but ones that were more energy efficient as well.
Looking at the industry landscape, Samsung has been falling behind as Chinese manufacturers are using silicon-carbon batteries that offer higher capacities while taking up less space inside their phones. Samsung used a little silicon-carbon technology with the batteries powering the Galaxy Z Fold 8, Galaxy Z Fold 8 Ultra, and the Galaxy Z Flip 8. The amount of silicon-carbon used was so little that these batteries are still classified as lithium-ion.
A 5700mAh battery for the Galaxy S27 Ultra would result in a 14% increase
If the 5700mAh battery capacity for the Galaxy S27 Ultra is true, it would be a 14% increase over the battery in the Galaxy S26 Ultra, a huge jump for one year. Samsung has been apprehensive about raising battery capacities on its flagship phones ever since the Galaxy Note 7 was recalled twice and later canceled after the battery in several units exploded causing property damage and injuries in a few cases.
The Galaxy Note 7 battery explosions forced the FAA to ban the device from being carried on planes by passengers, or packed in suitcases loaded on all flights.
Galaxy S27 Ultra: 6.9 inch M16 Display | 5700mah battery
— Anthony (@TheGalox_) September 17, 2026
Galaxy S27 Pro: 6.5 inch M16 Display | 5200mah battery
S27 Pro will deliver significantly longer battery life than S26 Ultra, and S27 Ultra will be unlike anything we've seen from Samsung in battery life pic.twitter.com/Xf0qrNBapb
It was later determined that design errors and manufacturing mistakes caused by the two companies contracted by Samsung to supply it with the 3500mAh Note 7 cells were at fault. The actual capacity of the battery did not lead to the explosions. One major design flaw failed to leave room for the battery to expand during regular use.
China's 3C safety mark is required for all electronic products, toys, electrical applicances, and automotive parts to protect the health and safety of consumers in the country. It is similar to the UL (Underwriters Laboratories) mark in the States although participation in the latter is voluntary.
The battery capacity for the Galaxy S27 Pro is also revealed
The leaked 3C listing also shows a 5200mAh battery for the Galaxy S27 Pro. This is expected to be a compact version of the Galaxy S27 Ultra but without support for the S Pen.
Twitter tipster Anthony also posted information about the S27 Ultra and S27 Pro displays
X leaker Anthony, also known as @TheGalox_, repeated the data from the 3C leak; he also added that the Galaxy S27 Ultra and Galaxy S27 Pro will both use an M16 display. This screen features a huge jump to a peak brightness of 10,000 nits compared to a peak brightness of 6,000 nits for the M14 display.
Which Galaxy S27 Ultra rumor do you want to be true the most?
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We can expect Samsung to hold its next Unpacked event unveiling the Galaxy S27 series in January or February 2027. The new devices would be released in February or March. Other models expected to be unveiled during the next Unpacked event will include the Galaxy S27 and the Galaxy S27+.
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