When Samsung launches the Galaxy S27 Ultra early next year, the flagship phone could be much different phone compared to the Galaxy S26 Ultra. A slew of rumors and confirmed news in the last few days revealed one massive upgrade and at least two potential downgrades.First, the upgrade with the rumored debut of a silicon-carbon battery in the S27 series. This news isn't totally surprising as Samsung finally put this newer battery technology in the recently launched Galaxy Z Fold 8 and Z Fold 8 Ultra.The rumor comes from two different sources: The Galox on X and YouTuber TechDroider. Both claimed that the S27 Ultra will get a 5700 mAh silicon-carbon battery.If the battery rumor is true this would be the first capacity upgrade to the Ultra model since the Galaxy S20 Ultra. That's seven generations of phones with essentially the exact same battery.While Chinese phone makers have been pushing silicon carbon battery equipped devices since 2024, Samsung has taken a more conservative approach.“We have been testing silicon batteries for quite some time. We’re looking at being very — I wouldn’t say conservative — but more taking it one step at a time," Samsung's Jay Kim — the executive VP of the Galaxy Z Fold 8 series — told Tom's Guide Mark Spoonauer.Still, the new battery bumped the Z Fold 8 Ultra up to 5,000 mAh, a big boost from the 4,400 mAh lithium ion in the Fold 7.Get instant access to breaking news, the hottest reviews, great deals and helpful tips.It doesn't necessarily mean Samsung was always going to put a silicon-carbon battery in its main phone line but signs are looking good.Worse cameras