# The Galaxy S27 Ultra is certified with a 5,700mAh battery

Source: https://idevice.com/the-galaxy-s27-ultra-is-certified-with-a-5-700mah-battery
Published: 2026-09-18

> China's 3C agency has certified the Galaxy S27 Ultra with a 5,534mAh rated cell, which works out to 5,700mAh typical, and the Galaxy S27 Pro at 5,200mAh typical. Both are expected to use silicon carbon, and both were already certified for 60W wired charging.

China's 3C database now lists the Galaxy S27 Ultra with a 5,534mAh rated cell.

Rated capacity is the conservative measurement, and it translates to a typical capacity of 5,700mAh, which is the number a phone gets sold on. SammyGuru found the same agency listing for the [Galaxy S27 Pro](https://idevice.com/phones/galaxy-s/roadmap) at 5,087mAh rated, or 5,200mAh typical. Both figures have been circulating as rumors for months. A regulator's database is a different kind of evidence.

The S26 Ultra ships with 5,000mAh. A move to 5,700mAh is roughly 14 percent more capacity, and phone batteries do not usually grow in steps that size. Samsung has spent several generations holding the Ultra at 5,000mAh while adding brighter screens and hungrier chips on top of it, which is why battery life on that line has been flat rather than better.

Silicon carbon cells pack more capacity into the same physical volume than the lithium ion packs Samsung has used on its slab phones, so a bigger figure doesn't have to mean a thicker phone, and that is what lets the number move now. Samsung already ships silicon carbon in the Galaxy Z Fold 8 and Flip 8, where the space constraint is far tighter. Bringing it to the S line is the obvious next step, and the S27 is where it lands.

Both phones were certified earlier for 60W wired charging, the same speed Samsung introduced on the S26 Ultra this year. So the S27 Ultra pairs a bigger tank with a filler that stays the same size, and a full charge will take marginally longer than it does today. That is the trade most people would take.

Battery is also the spec buyers feel every day, in a way they do not feel a camera sensor or a chip benchmark. A phone that gets to bedtime with something left is a different phone from one that needs a top-up at six. An extra 700mAh will not rewrite that experience on its own, because software and screen brightness do most of the work, but it is the first time in years Samsung has given the Ultra more to spend.

What a 3C entry proves is narrow. It proves a cell with that rated capacity has been submitted for certification, which is a reliable read on battery and charging and a poor one on everything else. Samsung has said nothing about the S27, and the launch is not expected until early 2027. Screen, cameras, chip and price are all still rumor.

The phone on sale is the S26 Ultra and it will be the phone on sale for months, so nothing here changes what anyone buys today. What the listing does is set the bar the S27 Ultra has to clear, and it puts that bar higher than any Samsung slab phone has managed.