The Galaxy S27 battery finally seems poised to make the leap many have been waiting for for years. According to a leak, the Samsung Galaxy S27 Pro will feature a 5,200-mAh battery and the Galaxy S27 Ultra around 5,700 mAh —meaning both models would break through the 5,000-mAh barrier that Samsung’s top-tier smartphones have been stuck at for several generations. This hasn’t been confirmed yet; the figures come from pre-production samples.
The Most Important Points at a Glance
- The Galaxy S27 Pro is expected to have a typical battery capacity of around 5,200 mAh (5,087 mAh “rated”).
- For the Galaxy S27 Ultra, a capacity of about 5,700 mAh is being discussed (5,534 mAh “rated”), possibly even 5,800 mAh.
- For the Ultra, that would represent an increase of about 15 percent compared to the Galaxy S26 Ultra (5,000 mAh).
- Likely reason: the switch to silicon-carbon batteries with higher energy density.
- A potential downside: shorter battery life. The market launch is expected in January or February 2027.
Galaxy S27 Battery: How Big the Cells Will Be in the Pro and Ultra Models
The information comes from the Dutch blog GalaxyClub, which sourced it from import-export databases. The figures cited are the so-called “rated” values—that is, the guaranteed minimum capacity of the batteries. For marketing purposes, Samsung usually specifies the slightly higher “typical” value later on—and that’s exactly what ends up on the spec sheet.
Specifically, here’s how it breaks down: The new Galaxy S27 Pro, which is positioned below the Ultra, is expected to have a 5,087 mAh (rated) battery and will likely be marketed as a 5,200 mAh model. The Ultra goes one step further with 5,534 mAh (rated), which works out to about 5,700 mAh typical. With a bit of luck, GalaxyClub even thinks 5,800 mAh is possible.
| Model | Battery (rated) | Battery (typical, expected) | Comparison |
|---|---|---|---|
| Galaxy S27 Ultra | 5,534 mAh | ~5,700 mAh | + ~15% compared to S26 Ultra |
| Galaxy S27 Pro | 5,087 mAh | ~5,200 mAh | new model |
| Galaxy S26 Ultra (2026) | – | 5,000 mAh | Current status |
For context: Our colleagues have not yet been able to confirm the battery specifications for the Galaxy S27 and S27+. However, this topic isn’t entirely new to us— the first details about the Galaxy S27 Pro and its role in the model lineup emerged several months ago.
Silicon-carbon batteries: more capacity, but a potential catch
How Samsung will fit the larger capacity into the device’s body is still a matter of speculation. The most obvious solution is switching to silicon-carbon batteries. This technology allows for higher energy density while maintaining the same or smaller form factor—Chinese manufacturers have been using it for some time. Samsung has only just begun using this technology in the recently unveiled Galaxy Z Flip 8 and Z Fold 8 foldable phones, and the Galaxy S27 series is likely to continue down this path.
However, this isn’t without compromise. According to the EU EPREL label, the specified battery life for the new Z models has dropped to 1,200 charge cycles—their predecessors managed at least 2,000 cycles. In purely mathematical terms, this means the battery capacity will fall below the 80 percent mark sooner. It remains to be seen whether Samsung will improve this figure before the S27 series launches.
When will the Samsung Galaxy S27 be released?
These figures are still based on “samples,” meaning they likely come from pre-production batteries. Samsung is currently in the so-called device verification testing phase—so the capacities could very well change before the devices are ready for mass production. The Galaxy S27 series is expected to launch in January or February 2027, likely via an Unpacked event, as has become customary.
Frequently Asked Questions About the Galaxy S27 Battery
How big is the battery in the Galaxy S27 Ultra?
According to the leak, the battery capacity is 5,534 mAh (rated), which Samsung will likely market as around 5,700 mAh (typical)—an increase of about 15 percent compared to the Galaxy S26 Ultra’s 5,000 mAh.
What is the battery capacity of the Galaxy S27 Pro?
For the S27 Pro, the leak cites 5,087 mAh (rated), so the typical capacity is expected to be around 5,200 mAh.
Why are the batteries getting bigger?
Most likely thanks to silicon-carbon batteries, which offer higher energy density while maintaining the same form factor. This allows for more capacity in the smartphone without making it thicker.
Have these figures been officially confirmed?
No. The figures come from import-export databases and refer to pre-production samples. They may still change before the market launch in early 2027.
Conclusion: Finally Some Progress, But With a Caveat
If the numbers are correct, this would be the most long-overdue battery leap in years. The fact that Samsung is finally breaking the 5,000 mark with the Ultra and, on top of that, introducing a Pro model with 5,200 mAh sends a clear signal—especially since the competition from China has long since taken the lead in this area. The downside remains the potentially lower cycle life of the new cells. More capacity is of little use if the battery ages faster as a result. As long as these are only pre-production figures, the bottom line remains: nice, but let’s wait and see for now.
Sources: GalaxyClub, WinFuture
