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Consumer reported severe battery failure & fire hazard with wearable health tracker. After five hardware failures, unit overheated while charging on charging dock, causing Li-ion battery to swell & casing to deform & stuck to charger. Thermal risk occurred despite proper use.

Product Details

Product Description: Ultrahuman smart ring wearable health tracker. Color: Matte Grey, Size: Size 8. The device consists of a titanium outer shell, a resin inner shell housing sensors and a lithium-ion battery, and a proprietary charging dock.
Manufacturer/Importer/Private Labeler Name: Ultrahuman Healthcare SP LLC
Brand Name: Ultrahuman
Model Name or Number: Ultrahuman Ring AIR
Serial Number:
UPC Code:
SKU#:
Date Manufactured:
Retailer: Ultrahuman
Retailer State: Arizona
Purchase Date: 6/18/2025
Product Category: Sports and Recreation
Product Type: Track, Field & Exercise
Product Code: Personal Fitness/Activity Trackers (5038)

Associated Recall

Incident Details

Incident Description: I am reporting a severe battery failure and fire hazard involving a wearable health tracker called the Ultrahuman Ring. Over my warranty period, I experienced constant hardware failures, requiring five separate replacement rings. Recently, while attempting to charge one of the defective rings on its proprietary charging dock, the device became pretty hot to the touch. The internal lithium-ion battery rapidly expanded, causing massive physical bumps to form on the ring's casing. The swelling was so severe that the ring became physically stuck to the charger. The product was being used exactly as intended for charging. Fortunately, no injuries occurred because I noticed the extreme heat and disconnected it before it could catch fire or explode, but the device poses a severe thermal runaway risk. I had previously contacted their support about another ring not connecting, but the issue with the battery on the previous ring did not happen yet, so Ultrahuman was not contacted about the expanding battery.
Incident Date: 3/23/2026
Incident Location: Home/Apartment/Condominium

Victims Involved

Injury Information: Incident, No Injury
My Relationship to the Victim: Self
Sex: Unknown
Victim's Age When Incident Occurred:

Comments from the Manufacturer/Private Labeler

Additional Details

Submitter has product?: Yes
Product was damaged before incident?: No
Product was modified before incident?:
If yes to any, explanation:
Have you contacted the manufacturer?: No
If Not, Do you plan to?:

Report Number: 20260323-A4320-2147322367
Report Date: 3/23/2026
Sent to Manufacturer/Importer/Private Labeler: 3/26/2026
Report First Publication Date: 4/9/2026
Category of Submitter: Consumer