Samsung Galaxy S27 Ultra battery and charging: Everything we know so far
Most sources agree that the Galaxy S27 Ultra will get a battery upgrade, but how big will it be?
The Galaxy S27 Ultra might finally get a battery upgrade (S26 Ultra on the picture for illustrative purposes) | Image by PhoneArena
There is still plenty of time until Samsung officially unveils its next flagship phone, the Galaxy S27 Ultra, but early leaks and rumors have already started appearing and the most heated debate is about its battery size.
Samsung has been using the same 5,000mAh battery on its flagships since the launch of the Ultra series with the Galaxy S20 Ultra in 2020.
And while this used to be considered a big battery size then, many Android phones are now above the 7,000mAh mark, far surpassing Samsung.
The good news is that change is coming with the Galaxy S27 Ultra, but... it's still not clear how big the change will be.
Galaxy S27 Ultra battery size leaks and rumors
In early July 2026, some early claims from an unproven source (@phonefuturist) surfaced about the S27 Ultra getting a 5,600mAh or 5,800mAh battery size.
Those claims were quickly refuted by proven industry insider Ice Universe, who said those claims lacked substance.
The original claim was based on alleged information that Samsung SDI was testing a new battery size of 5,600 or 5,800mAh. However, Samsung does not just use one battery supplier for the Galaxy Ultra series. So even if this new size was tested by one supplier, that is not enough evidence to conclude such a battery size will indeed be available at all suppliers, and ultimately on the Galaxy S27 Ultra.
The truth is that currently we just don't know what battery size Samsung will use. An increase in battery size is expected, but there is no credible confirmation of a jump above 5,500mAh.
If Samsung goes with only a small battery increase, it might even lose the battle with the iPhone 18 Pro Max. For years, Apple's flagship phone relied on better-optimized software rather than a big battery size to achieve its battery life claims. But now, even the iPhone 18 Pro Max is expected to feature a 5,567mAh battery for the US model (the international version is getting a smaller 5,391mAh battery).
Galaxy S27 Ultra charging leaks and rumors
The current Galaxy S26 Ultra is Samsung's first phone to feature 60W fast wired charging speeds, a welcome upgrade over the 45W speeds of previous Galaxies.
And unlike Chinese rivals who use proprietary charging technologies to hit 100W or sometimes even higher speeds, Samsung relies on the universal USB-C Power Delivery (PD) standard. This means that you can hit the maximum 60W speeds with the Galaxy S26 Ultra no matter whether you are using an official Samsung charger, or a third-party USB-C PD charger from companies like Anker, Ugreen or others.
In stark contrast, you can only hit the maximum charging speeds on phones from brands like Xiaomi, Oppo and Vivo if you use their own charger. If you use a standard USB-C PD charger on those phones, they will default to a much slower charging speed.
So, what about the Galaxy S27 Ultra? There are no indications that it is getting faster wired charging speeds. We expect it to stick with the same 60W speed as the Galaxy S26 Ultra.
Galaxy S27 Ultra wireless charging leaks and rumors
The Galaxy S26 Ultra also made the jump to supporting 25W wireless charging speeds, while previous Galaxy phones defaulted to 15W charging.
But the S26 Ultra did not use magnets, so the phone does not support Qi2/MagSafe wireless charging, a disappointment for many. The only way to get magnetic charging to work is to use a case with magnets.
This is one more missing feature that has some users upset. iPhones have supported MagSafe charging for years and even the Pixel 10 series added support for Qi2 magnetic charging in 2025.
So far, there are no credible leaks about the Galaxy S27 Ultra getting Qi2 magnetic charging support, but there is an air of expectation about this ultimately arriving to Samsung phones at some point.
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