The Galaxy S27 Ultra is rumored to catch up to and surpass the hefty battery of the iPhone 18 Pro Max, but this may not be the only upgrade it has. Not only the upcoming flagship will improve on the Galaxy S26 Ultra’s battery capacity, but it may also use a nifty trick to secure adequate charging times.
Galaxy S27 Ultra may get faster charging with a clever trick
We have already heard that Samsung may finally move on from the 5,000 mAh battery capacity it has been using for years and equip the Galaxy S27 Ultra with a much larger 5,700 mAh battery. What remained unclear was how much faster will this battery charge, but according to leaker @WalleGalaxy on X, there will be an improvement to the charging speeds as well.
This upgrade won’t be based on a classic speed improvement, and the S27 Ultra may stick to the 60W charging, but it could sustain higher charging speeds for a longer period at the beginning of the charging cycle. The leaker says this should lead to slightly shorter overall charging times, even with the rumored larger battery.
What do you want from the Galaxy S27 Ultra battery the most?
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Galaxy S27 Ultra will undoubtedly have multiple battery improvements
Galaxy S27 Ultra may share its design with the Galaxy S27 Pro. | Image by TheGalox_ on X
Hearing of a faster charging battery is hardly surprising, considering how far behind Samsung has been in terms of both charging speeds and battery capacity in comparison with the leading Chinese brands. It’s still impressive that the company may not aim for higher wattage and instead make a switch in the charging curve to achieve similar results.
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This upgrade should easily improve on the relatively unimpressive performance of the Galaxy S26 Ultra. The current top-tier Galaxy supports Super Fast Charging 3.0 with up to 60W, which allows it to reach 75% in 30 minutes according to Samsung.
In his in-depth review of the S26 Ultra, my colleague Victor got to 76% in 30 minutes, and filling the whole battery took him 49 minutes. This is already better than what Victor got from the iPhone 18 Pro Max battery charging test. Apple’s best gets to 71% in 30 minutes, from where the charging speed drops significantly, and it takes 1 hour 8 minutes to reach 100%.
Could Samsung use Apple’s battery tech for these improvements?
For the two iPhone 18 Pro models, Apple has reportedly used the metal-can battery tech, which it first patented in 2020 and used in the Apple Watch Series 5. This could be the reason for its higher capacity, when compared to the iPhone 17 Pro, though the better performance is also due to the more efficient chipset.
Even with these improvements, Chinese Android manufacturers are at a completely different level compared to both Apple and Samsung. Despite this, they’re reportedly investigating how to utilize this metal-can tech and combine it with the silicon-carbon tech they already use. This could lead to devices with over 10,000 mAh batteries, which would outperform even impressive phones like the Xiaomi 18 Pro Max and its 8,500 mAh battery.
Even with the rumored 14% battery capacity improvement of the Galaxy S27 Ultra, compared to the S26 Ultra, it’s not a huge shock that people online remain unimpressed with Samsung. Some users on Reddit appreciate the upgrade, but the vast majority seem to expect silicon-carbon batteries and much more impressive capacities to challenge the Chinese ultra flagships.
A capacity upgrade may not cut it for some Android fans. | Image by Reddit (screenshot
Longevity is just as important as the battery size
As good as a 10,000 mAh silicon-carbon battery may sound, I am still worried about how long such a monster would perform at its best. I’d much rather have a phone with a bit over a day of battery life, but get the same performance over all two or three years of its life. This is something Samsung has been providing for years, and I hope the Galaxy S27 Ultra continues to prioritize longevity instead of numbers.
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Ilia, a tech journalist at PhoneArena, has been covering the mobile industry since 2011, with experience at outlets like Forbes Bulgaria. Passionate about smartphones, tablets, and consumer tech, he blends deep industry knowledge with a personal fascination that began with his first Nokia and Sony Ericsson devices. Originally from Bulgaria and now based in Lima, Peru, Ilia balances his tech obsessions with walking his dog, training at the gym, and slowly mastering Spanish.
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