The Galaxy Z Fold 8's specs all but confirm a huge upgrade for the Galaxy S27 series

After months of leaks and rumors, Samsung has officially unveiled its latest Z-series phones. Now the company must have shifted its focus to the Galaxy S27 lineup, which could launch sometime in Q1 next year. While we have been hearing plenty of rumors about the hardware changes in the upcoming S-series devices, all of it remains information that should be taken with a grain of salt, as it hasn't been officially confirmed.

However, the battery details of the latest Z-series smartphones all but confirm that Samsung has finally listened to Galaxy users, and the Galaxy S27 family could offer what they have been demanding for many years.

The Galaxy S27 series could get Samsung's biggest battery upgrade

Other than the all-new Flex titanium technology that has been used in the Z Fold 8 and Z Fold 8 Ultra, Samsung finally embracing silicon-carbon batteries was one of the main highlights for me of the recent Galaxy Unpacked event. For reference, it's the same tech that allows Chinese manufacturers to offer huge battery capacity in their smartphones, for instance, the 7,300 mAh cell in the OnePlus 15. However, unlike competitors like the Moto Razr Fold that come with a huge 6,000 mAh battery, Samsung decided to continue with its conservative approach of giving a small battery bump to its foldables, despite using silicon-carbon tech.

For reference, the Z Fold 8 features a 4,800 mAh cell, which is a jump of 400 mAh from its predecessor, and the Ultra model becomes the first foldable from the company to feature a 5,000 mAh battery. Still, the most important news is that the company has finally started using the latest battery technology.

That said, it appears to be a foregone conclusion that the upcoming Galaxy S27 phones could also launch with the new battery tech. Interestingly, we have been hearing rumors for some time that the upcoming S-series would use the Si-C battery, and its use in the latest Z series devices increases the likelihood of that happening.

Samsung could continue its conservative approach

The biggest demerit of silicon-carbon batteries is probably the reason why Samsung decided not to take a big leap in the battery capacity of the Z series phones and would most likely follow the same approach in its upcoming S series devices. You see, unlike regular lithium-ion batteries, Si-C batteries enlarge in size later into their lifespan. After a couple of years, the expanded battery might press against the display and other components and affect their functionality.

So, in the case of the Z Fold 8 Ultra, Samsung might have decided not to take a big jump in the battery capacity and leave some space inside the phone as a safety margin to accommodate the gradual expansion of the silicon-carbon battery over the next few years. In addition to this, the Galaxy Note 7 fiasco might be another reason why the tech giant is taking a conservative approach with its battery capacity.

Nevertheless, the Z Fold 8 Ultra features a 5000 mAh battery in comparison to the Z Fold 7's 4400 mAh battery, despite both having the same dimensions and weight. That's an increase of around 14%. The S26 Ultra features a 5000 mAh battery, so its successor could come with a battery capacity of around 5700 mAh if Samsung gives it a 14% increase as well.

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