Relative to other health wearables on the market, Oura Ring has a long battery life and quick charging time—two of the many reasons members love Oura Ring.

To calculate expected battery life, we conducted extensive testing using new, unworn Oura Ring 4 devices. We assumed Oura Ring 4 was worn all day, Automatic Activity Detection with Activity Heart Rate capture was engaged for one hour per day, Blood Oxygen Sensing (SpO2) was disabled, and eight hours of sleep were tracked per night. We tested using sizes 8-10, which make up the majority of members' ring sizes. The ring was fully charged at the start, and we drained it to 0%. Based on this, Oura Ring 4 achieved a battery life of 5-8 days.

What can cause variations?

• Ring size: Larger rings have slightly larger batteries, while smaller rings have slightly smaller batteries
• Blood Oxygen Sensing: Many members choose to turn off Blood Oxygen Sensing if they see that after several nights of data, they’re receiving an Optimal or Good breathing rating or oxygen saturation levels of 95% or higher. For those who leave Blood Oxygen Sensing on, battery life may be up to two days shorter, depending on sleep duration
• Automatic Activity Detection with Activity Heart Rate: Battery life may be up to one day longer for members who use this feature for less than one hour every day. For those who use it more frequently (e.g., 2-3 hours per day), it may be up to two days shorter.

Ultimately, actual battery life will vary based on the factors above and other factors, including ring age, total usage to date, and other features.

Oura Ring 5: A fully charged ring typically lasts 6-9 days.

Oura Ring 4: A fully charged ring typically lasts 5–8 days.

Oura Ring Generation 3: A fully charged ring may last up to seven days.

Note that these ranges are for new Oura Ring devices. All rechargeable batteries are consumables and have a limited lifespan, so their capacity and performance will gradually decline with time.

Battery life and longevity depend on Oura Ring size, Oura App settings, feature configuration, activity, battery age, usage, and many other factors; actual results will vary. Battery life and charge cycles vary by use and settings.

Oura Ring 4 battery estimates are based on consumption data of internal users, analyzing usage from 100% to 0% battery levels. Oura Ring Generation 3 battery estimates were used as a reference to validate any improvements. 

Remember, depending on battery level, it takes only 20-80 minutes to charge your Oura Ring 4, so feel free to drop it onto the charger for short bursts more frequently (e.g., when you take a shower each day). Not only will this not damage the battery, but Oura’s lithium polymer batteries actually perform the best when they're at 25-80%.

Keep in mind that all rechargeable batteries are consumables and have a limited lifespan, so their capacity and performance will gradually decline with time.

Maintaining this battery range on a regular basis will result in the lowest battery deterioration rate over time.

See more tips on how to ensure the best possible battery life here.

Our testing was conducted in a controlled environment before Oura Ring 4 was available for purchase. Now that Oura Ring 4 is commercially available, we are actively monitoring real-world battery life. Based on early usage of Oura Ring 4, these controlled environment estimates remain accurate.