# Which smartwatch with heart rate monitor offers the best battery life? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which smartwatch with heart rate monitor offers the best battery life?

## Products

### Garmin Forerunner 265 (Model 010-02810-00)
```yaml
product: garmin-forerunner-265-model-010-02810-00
brand: Garmin
price_gbp: 264.27
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
screen_size: 33 mm
battery_life: up to 13-days
compatibility: Android and iOS
water_resistance: 5 ATM
```

- **Price:** £264.27 [^1]
- **Summary:** The Garmin Forerunner 265 is an AMOLED touchscreen running smartwatch with multi-band GPS and wrist-based heart rate monitoring, designed for structured training with features like Training Readiness and daily suggested workouts. It's built for runners and other training-focused users who want longer battery life while staying connected for notifications via Garmin Connect. The 33 mm screen size makes it a good fit for people who want a larger display than the smaller 265S.
- **Ideal For:** For the best battery life with a heart rate monitor, choose the Forerunner 265 because it has up to 13-days of battery life in smartwatch mode while using wrist-based heart rate monitoring.
- **Additional Sources:** [^2]

---
## References & Sources
[^1]: Home Depot, accessed 2026-06-23. https://www.homedepot.com/p/Garmin-Forerunner-265-Running-Smartwatch-with-Black-Bezel-1-81-x-51-in-Black-010-02810-00/335686254
[^2]: Best Buy, accessed 2026-06-23. https://www.bestbuy.com/product/garmin-forerunner-265-gps-smartwatch-46-mm-fiber-reinforced-polymer-black-2023/JXF9YF4J4X