Galaxy Ring Swelling Exposes a Critical Flaw in Smart Ring Design

Samsung‘s venture (Galaxy Ring) into the smart ring market has been overshadowed by a viral battery swelling incident, raising critical safety concerns about the durability and safety of miniature lithium-ion cells in a rigid form factor.

Update:

– I was denied boarding due to this (been travelling for ~47h straight so this is really nice 🙃). Need to pay for a hotel for the night now and get back home tomorrow👌

– was sent to the hospital, as an emergency

– ring got removed

You can see the battery all… https://t.co/SRPfYI92Zg pic.twitter.com/ob8uUp5BeW
— Daniel (@ZONEofTECH) September 29, 2025

The incident, reported by tech creator Daniel Rotar, involved the battery inside his Galaxy Ring swelling rapidly while he was wearing it. The expansion trapped the rigid device on his finger, forcing him to miss a flight and require hospital assistance for removal.

The Design Conundrum: Swelling Inward

The primary danger is a direct result of the design: the Galaxy Ring’s unyielding, titanium casing prevents the battery from swelling outward, forcing the expansion inward and pressing painfully against the user’s finger. The ring was successfully removed at the hospital using medical lubricant and ice.

Samsung labeled the case an “extremely rare case” in an official statement and confirmed it has retrieved the device for a full investigation, promising to share the results. The company also fully compensated the user for the travel disruption caused by the emergency.

Broader Issues: Degradation and Multiple Cases

While Samsung cited rarity, user reports suggest a wider issue:

1. Prior Failure: The affected user reported months of degraded battery performance (dropping from seven days to under two days) before the swelling occurred.

2. Second Swelling: Social media posts revealed a separate case where a Galaxy Ring showed visible battery bulging after less than three weeks of use, indicating the failure mode is not unique.

3. Widespread Battery Drain: Multiple users on forums report significant, premature battery life degradation across the board, with rings struggling to hold a charge for even a full day.

Although saltwater exposure was initially speculated as a cause, the pattern of early failure and widespread degradation suggests a potential flaw in the battery stress management or manufacturing process of the ultra-compact cells.

This incident is a forced reckoning for the industry, highlighting the significant challenge of engineering safety and durability into rigid, skin-contact wearables powered by volatile lithium-ion technology.