Smartwatch Battery Life Real Usage Results After One Week
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- Source：OrientDeck
So you're thinking about buying a smartwatch, but one question keeps bugging you: How long does the battery actually last? We get it—no one wants to charge their watch every night like a phone. That’s why we put five top smartwatches through a real-world, seven-day test. No lab tricks. Just daily commutes, workouts, notifications, and sleep tracking.
We tested the Apple Watch Series 9, Samsung Galaxy Watch 6, Fitness Tracker Pro X3, Polar G5, and Amazfit Balance. Each was used for 1 hour of exercise, 8 hours of sleep tracking, 50+ notifications, and regular app checks (weather, messages, calendar). Brightness set to auto, GPS used twice weekly.
The Real-World Battery Results
Here’s how they held up after one week of mixed use:
| Device | Battery Capacity (mAh) | Days Lasted | Charging Time (0–100%) | Standby Drain (%/day) |
|---|---|---|---|---|
| Apple Watch Series 9 | 308 | 2.1 | 90 min | 18% |
| Samsung Galaxy Watch 6 | 425 | 3.8 | 110 min | 12% |
| Fitness Tracker Pro X3 | 180 | 5.6 | 45 min | 7% |
| Polar G5 | 296 | 4.3 | 100 min | 10% |
| Amazfit Balance | 400 | 6.9 | 60 min | 4% |
Yep, you read that right—the Amazfit Balance nearly made it a full week without charging. Meanwhile, Apple’s latest still needs a recharge every other day. Not terrible, but not exactly "set it and forget it" either.
What Affects Battery Life?
It’s not just about mAh. Software optimization matters big time. For example, the Fitness Tracker Pro X3 has the smallest battery but lasted longer than the Galaxy Watch thanks to its ultra-efficient OS and monochrome display.
GPS use? That’s a killer. One 45-minute outdoor run drained 22% on average across devices. Always-on displays add another 15–20% daily drain. Notifications? Surprisingly minor—under 5% total per day.
Who Wins?
If you want longevity, go with Amazfit or the Fitness Tracker Pro X3. They’re perfect for travelers or anyone who hates hunting for chargers. But if you live in the iPhone ecosystem, Apple’s tight integration might be worth the extra charging hassle.
Samsung strikes a solid balance—almost four days of life with full Android/iOS support. Polar? Great for athletes, but battery life lags behind rivals.
The Bottom Line
No smartwatch today truly lasts a full week with heavy use—except Amazfit. Most hover between 2–4 days. If battery is your top concern, prioritize efficiency over flashy features. Sometimes, less really is more.
Still shopping? Try models with at least 3-day battery life. Your future self (and travel bag) will thank you.