If there is one spec on Samsung's top-end flagship that has never felt truly "Ultra," it is the 5,000 mAh battery that has remained unchanged for half a decade. Now, finally, the Galaxy S27 Ultra is rumored to receive a substantial capacity increase, approaching 6,000 mAh. According to the latest reports, Samsung is poised to break with tradition and deliver a generational leap that users have been waiting for.
The 5,000 mAh battery has been a staple for five generations
From the Galaxy S20 Ultra in 2020 to the current Galaxy S26 Ultra, Samsung has used the same 5,000 mAh cell without any capacity upgrade. While competitors introduced larger batteries and faster charging, Samsung's Ultra line stayed stagnant. This has led many users to wonder why such an expensive and powerful device could not offer better battery life. The Galaxy S27 Ultra appears set to address this need.
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GalaxyClub reports a rated capacity of 5,534 mAh
According to a report by GalaxyClub, the Galaxy S27 Ultra will feature a battery with a rated capacity of 5,534 mAh, which translates to a typical marketed capacity of around 5,700 to 5,800 mAh. This is an increase of about 15% over the Galaxy S26 Ultra's rated 4,850 mAh. The upgrade is substantial and will bring the device's battery life to truly competitive levels. Additionally, the new Galaxy S27 Pro, an unannounced model in the lineup, is said to have a rated capacity of 5,087 mAh, likely marketed as 5,200 to 5,300 mAh. Details on the base Galaxy S27 and S27+ are not yet available.
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The upgrade follows the technology debut in the Z Fold 8 series
The new battery technology first appeared in the Galaxy Z Fold 8 series, and Samsung is now bringing it to traditional flagship phones. This suggests that the company has resolved any issues related to energy density or mass production. The capacity increase likely comes from advanced lithium-ion cells with improved chemistry, allowing more energy storage without increasing physical size. For comparison, the Google Pixel 10 Pro XL offers 5,060 mAh, while the iPhone 17 Pro Max has 4,685 mAh. With nearly 6,000 mAh, Samsung could gain a significant edge in battery life.
When will the Galaxy S27 Ultra arrive
Samsung's new flagships are expected early next year, likely between January and February 2027. Official launch will confirm the specs, but rumors indicate that the company is betting heavily on the battery to differentiate itself. For users who rely on their phone for gaming, streaming, or work, such an upgrade could be a game-changer. In the meantime, keep in mind that a common mistake with Android backups can waste gigabytes of cloud storage: read the article on Android backups wasting Google storage to optimize your storage.
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For more on Samsung's battery history, check the Wikipedia page on Samsung Galaxy S series.
Source: https://9to5google.com/2026/07/27/samsung-galaxy-s27-ultra-battery-upgrade-rumor
