Samsung Galaxy S26 Edge Leaks: 5.5mm Thin with a 4,200mAh Battery

New leaks suggest Samsung is pushing the boundaries of smartphone design with its upcoming Galaxy S26 Edge, aiming to make the device even thinner than its predecessor while simultaneously packing a larger battery. The S26 Edge is widely expected to replace the “Plus” model in Samsung’s 2026 flagship lineup.

According to prominent leaker Ice Universe, the Galaxy S26 Edge will measure just 5.5mm thick and house a 4,200mAh battery. This combination represents a significant engineering challenge and a direct response to criticisms of the current model.

At 5.5mm, the S26 Edge would be 0.3mm slimmer than the 5.8mm Galaxy S25 Edge, placing it on par with the rumored thickness of Apple’s iPhone 17 Air. More importantly, the 4,200mAh battery would be a notable boost from the 3,900mAh cell in the current model, addressing one of its biggest weaknesses. This larger capacity would also give it a considerable advantage over the iPhone 17 Air’s rumored ~2,900mAh battery.

The rumored improvements appear to be a direct answer to the major criticisms leveled against the Galaxy S25 Edge. In our review, while the device was praised for its slim design, it was heavily critiqued for its “mediocre” battery life, poor thermal management, and slow charging speeds. A larger 4,200mAh battery could be the first step in rectifying one of those key issues.

This leak aligns with previous reports of a major branding shake-up for the Galaxy S26 series. Samsung is expected to replace the “Plus” model with the “Edge,” resulting in a lineup consisting of the Galaxy S26 Pro (replacing the base model), Galaxy S26 Edge, and Galaxy S26 Ultra.

The Galaxy S26 Edge Android phone is shaping up to be Samsung’s attempt to perfect its ultra-thin smartphone formula. By aiming for a slimmer design without compromising—and in fact, improving—battery capacity, the company seems determined to win over critics. The key question remains whether it can also solve the issues of thermal performance and charging speeds when the new lineup launches early next year.