Samsung Galaxy S25 Edge battery capacity just leaked — we have bad news

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The trade-off for a thinner design

samsung galaxy s25 edge mockups at galaxy unpacked 2025
(Image credit: Future)

Ultra-thin phones seem to be the big tech trend of 2025, with the iPhone 17 Air and Samsung Galaxy S25 Edge launching this year, alongside handsets built by Chinese manufacturers like Honor and Tecno.

For thin-phone skeptics, the worry is what this obsession with thinness will do to battery life. (And durability, but that's another story.)

The Tech Outlook spotted two battery listings for the Samsung Galaxy S25 Edge which carry a rated value of 3,786mAh. Even assuming that’s a rated value and the typical value will be 3,900mAh as tipped elsewhere, that’s still a worrying development.

But while phones with bigger screens usually compensate with a larger battery, the S25 Edge likely won’t have that — in fact, it’ll be 1,000mAh smaller than the 4,900mAh Plus model.

Fatal flaw or mild inconvenience?

Samsung Galaxy S25 Edge back

(Image credit: Future)

All of this adds up to a phone that may be a tricky sell to power users. This could be offset by support for fast charging, but rumor has it that the S25 Edge will only match the 25W wired charging of the regular model, and not the 45W speeds of the Plus and Ultra versions.

But to keep things in perspective, the battery life on the regular S25 is still pretty good.

Smartphone owners have gotten used to the nightly charging ritual associated with ownership, and as long as it gets through a day, most people won’t mind. It’s only when it badly undershoots that low-bar aim — like the Samsung Galaxy Z Flip 3 — that people are truly disappointed.

There’s also an argument that says ultra-thin phones simply aren’t aimed at power users, or those who obsess over the minutia of specs and comparison tables.

Galaxy S25 Plus held in the hand.

Samsung Galaxy S25 Plus (Image credit: Tom's Guide / John Velasco)

The only real advantage is weight and aesthetics, neither of which matter all that much to people looking to eke as much life out of their handsets as possible.

It’s still not clear if there is much market for ultra-thin smartphones, but we should find out soon. The Samsung Galaxy S25 Edge could launch as soon as May, according to the Korean publication Financial News.

That would give Samsung a march on its rivals, but if not, it’ll likely arrive in the summer alongside the Galaxy Z Fold 7 and Galaxy Z Flip 7.

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Alan Martin
Alan Martin

Freelance contributor Alan has been writing about tech for over a decade, covering phones, drones and everything in between. Previously Deputy Editor of tech site Alphr, his words are found all over the web and in the occasional magazine too. When not weighing up the pros and cons of the latest smartwatch, you'll probably find him tackling his ever-growing games backlog. He also handles all the Wordle coverage on Tom's Guide and has been playing the addictive NYT game for the last several years in an effort to keep his streak forever intact.

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