O Anel Oura 4 is widely praised for its advanced health tracking and improved efficiency, but battery life remains a key concern for buyers and long-term users. If you’re wondering how long the Oura Ring 4 lasts on a single charge—and what actually impacts its performance—this guide breaks it all down with real-world context.
We’ll cover official battery claims, real user experiences, factors that affect longevity, and practical ways to extend battery life without sacrificing features.
How Long Does the Oura Ring 4 Battery Last?
According to Oura, the Ring 4 delivers between 5 and 8 days of battery life on a full charge, depending on usage patterns and settings.
Official Battery Estimates
Oura’s testing assumes:
- Around 8 hours of sleep tracking per night
- 1 hour of Automatic Activity Detection (AAD) per day
- Blood oxygen (SpO₂) tracking turned off
Charging time typically ranges from 20 to 80 minutes, depending on remaining battery level.
If you want a deeper technical breakdown of how the device works, see our guide on how the Oura Ring 4 works.
What Affects Real-World Battery Life?
Actual battery performance varies based on several factors.
1. Ring Size
Larger rings contain slightly larger batteries, which generally last longer. Users with smaller sizes (especially sizes 4–6) often report shorter battery life.
If you’re unsure about your size, our guide on how to know your ring size accurately can help prevent sizing mistakes that may impact comfort and battery expectations.
2. Feature Usage
Some features draw significantly more power:
| Feature | Battery Impact |
| SpO₂ monitoring | Reduces battery by up to 2 days |
| Activity heart rate tracking | Heavy use drains faster |
| Frequent Bluetooth syncing | Minor but cumulative impact |
3. Battery Age
Like all lithium-ion batteries, capacity slowly decreases over time. After 6–12 months of daily use, some users notice a drop of 1–2 days in total battery life.
4. App & Sync Settings
Frequent background syncing, notifications, and Bluetooth connections can increase power consumption.
Real-World Battery Life: What Users Report
User feedback generally aligns with Oura’s estimates:
- 5–6 days with all features enabled
- 6–8 days with optimized settings
- 3–4 days for smaller sizes or heavy tracking use
Android Police and Reddit users consistently report that larger ring sizes last longer, while smaller sizes struggle to reach the upper range.
If you’re comparing generations, our breakdown of Oura Ring Gen 4 vs Gen 3 highlights battery improvements in detail.
How to Maximize Oura Ring 4 Battery Life
These proven strategies can extend your battery life without reducing core functionality:
1. Charge Strategically
Top up the ring while showering or getting dressed instead of waiting for a full drain. Frequent short charges are better for battery health.
2. Disable SpO₂ When Not Needed
If blood oxygen tracking isn’t essential, turning it off can add up to two extra days of battery life.
3. Limit Continuous Heart Rate Tracking
Use activity tracking selectively rather than continuously when possible.
4. Use Airplane Mode
When traveling or sleeping, Airplane Mode reduces background drain and preserves battery life.
5. Charge at Room Temperature
Extreme heat or cold can degrade battery health over time.
Is the Oura Ring 4 Battery Life Good Enough?
Yes — for a smart ring packed with sensors, 5–8 days is very competitive. While power users and smaller ring sizes may see lower performance, most users find the battery easy to manage with minimal lifestyle disruption.
If battery longevity is a priority, adjusting SpO₂ usage and charging strategically makes a noticeable difference.
For a full performance overview, see our detailed Oura Ring 4 review.
Frequently Asked Questions (FAQ)
How long does the Oura Ring 4 battery last in real life?
Most users report 5–6 days with normal usage. With optimized settings, some reach up to 8 days.
Does ring size affect battery life?
Yes. Larger ring sizes contain bigger batteries and typically last longer than smaller sizes.
Does SpO₂ tracking drain the battery?
Yes. Enabling blood oxygen tracking can reduce battery life by up to 2 days.
How long does it take to fully charge the Oura Ring 4?
Charging takes 20–80 minutes, depending on remaining battery level.
Is the Oura Ring 4 better than Gen 3 for battery life?
Yes. Battery efficiency is improved, though real-world gains depend on usage. See our comparison of Oura Ring Gen 4 vs Gen 3.
Can I extend battery life without losing features?
Yes. Disabling SpO₂, reducing syncing frequency, and using Airplane Mode can significantly extend battery life.
Final Takeaway
O Oura Ring 4 offers strong battery performance for a health-tracking wearable, especially when used thoughtfully. While heavy tracking or smaller sizes may shorten battery life, most users find it reliable, efficient, and easy to maintain with smart charging habits.
If you’re deciding whether it fits your lifestyle, monitoring your usage for the first few charge cycles will give you the clearest answer.