10 Best Long Battery Life Smartwatch 2025 in the United States

The Garmin Instinct 3 is a rugged outdoor smartwatch designed to last long on a single charge, boasting up to 24 days of battery life depending on usage. Its 1.3-inch AMOLED display offers bright and clear visuals, which is great for outdoor visibility but can use more power than simpler screens. To help with battery conservation, it features smart power-saving modes and SatIQ GPS technology that adjusts tracking intensity to save energy.

The watch comes with a durable, metal-reinforced bezel and fiber-reinforced polymer case, making it tough enough for outdoor adventures. A handy built-in LED flashlight adds extra convenience in low-light conditions. Health tracking features like heart rate monitoring and sleep analysis provide useful insights, though the health data should be seen as estimates rather than precise medical measurements. Weighing just 59 grams, it’s comfortable to wear for extended periods.

This watch suits outdoor enthusiasts and those who want long battery life without sacrificing functionality, but if you prefer a simpler display or are sensitive to price, it might feel a bit premium and power-hungry. Its rugged build and extended battery life distinguish it in the long-battery-life smartwatch category.

The Garmin Enduro™ 3 stands out as an ideal smartwatch for ultra-endurance athletes, given its exceptional battery life and robust features. With a battery life of up to 90 days in smartwatch mode and 320 hours in GPS mode with solar charging, it excels in longevity, making it perfect for long-duration outdoor activities. The always-on display ensures that key information is always visible, although this can impact battery life if not managed well with power-saving modes.

The 1.4-inch round touchscreen with a scratch-resistant sapphire lens offers durability and clarity, essential for rugged environments. The lightweight design, weighing only 63 grams, and the comfortable UltraFit nylon band make it suitable for extended wear, even in harsh conditions. The built-in LED flashlight is a handy addition for nighttime activities.

Preloaded TopoActive maps and dynamic routing enhance navigation, ensuring you stay on track during your adventures. However, the smartwatch's reliance on solar conditions for optimal battery performance might not be suitable for users in less sunny environments. The Garmin Enduro™ 3, with its extensive battery life and specialized features, is particularly beneficial for ultra-endurance athletes and outdoor enthusiasts who need a reliable and durable smartwatch for their demanding activities.

The Apple Watch Series 10 is a robust smartwatch that packs in a lot of features for health, fitness, and connectivity, but it falls short of expectations in the long-battery-life category. With a maximum battery life of up to 18 hours under normal use, it can extend to 36 hours in Low Power Mode. The fast charging feature is commendable, allowing the watch to reach 80% in about 30 minutes, which is convenient for quick top-ups but still requires frequent charging for all-day use.

The display is impressive, featuring an Always-On Retina display that’s bright and easy to read. Its health and fitness tracking capabilities are among the best in the market, providing advanced metrics, ECG functions, and comprehensive sleep tracking. This makes it a good option for those who are serious about monitoring their health. Another strength is its build quality. The watch is durable, water-resistant up to 50 meters, and dust-resistant (IP6X-certified), making it suitable for various activities, including swimming and outdoor sports. Its integration with the Apple ecosystem allows users to stay connected seamlessly, enjoying features like notifications and calls directly from their wrist.

Customization options are plentiful, allowing users to choose from various bands and watch faces, making it a stylish accessory. On the downside, users who are not already invested in Apple products may find it less appealing due to compatibility restrictions with iOS devices. Also, while the watch includes impressive features, the additional cost compared to other smartwatches may not justify the purchase for casual users.

While the Apple Watch Series 10 excels in health tracking and connectivity, its battery life may not meet the expectations of users looking for a long-lasting smartwatch, making it better suited for those who prioritize advanced features over extended battery performance.