Samsung could be preparing one of the biggest battery upgrades to its flagship Galaxy Ultra smartphone in years, with new certification information pointing to a substantial capacity increase for the upcoming Galaxy S27 Ultra.

The Galaxy S27 Ultra and Galaxy S27 Pro have reportedly appeared in China’s 3C regulatory certification database ahead of their expected launch in early 2027. The filings indicate both smartphones will receive larger batteries than their predecessors, although charging speeds may remain unchanged.

According to the certification information, the Galaxy S27 Ultra has a rated battery capacity of 5,534mAh. Manufacturers generally advertise a slightly higher typical capacity, meaning Samsung could market the phone with a battery of approximately 5,600mAh to 5,700mAh.

That would represent a significant departure for Samsung. Its Ultra flagships have remained at 5,000mAh for six years, while the reported S27 Ultra capacity would be roughly 10 per cent higher than the outgoing Galaxy S26 Ultra.

Samsung may also increase the battery capacity of the smaller Galaxy S27 Pro. Certification information points to a 5,087mAh rated cell, which could potentially be advertised as approximately 5,100mAh or 5,200mAh when the phone reaches the market.

While the larger batteries could improve endurance, Samsung does not appear to be increasing wired charging speeds at the same time.

The certification reportedly lists 60W wired charging for both the Galaxy S27 Ultra and Galaxy S27 Pro, matching the charging capability of the current Galaxy S26 Ultra.

The larger battery could nevertheless be an important upgrade for Samsung’s next flagship. Actual battery life will depend on factors including the processor, display, software optimisation and how the device is used, so the increase in capacity does not necessarily translate directly into an equivalent increase in operating time.

Samsung has yet to announce the Galaxy S27 series or confirm its final specifications, meaning the battery capacities should still be treated as preliminary until the company formally unveils the devices.

Australian pricing and availability have also not been announced.