Forerunner 255S Music GPS Running Smartwatch - Long Battery Life

In this review the Forerunner 255S Music is presented as a focused running smartwatch for athletes who want meaningful training guidance without a bulky wristwatch. The watch stands out for its combination of a slim, sunlight-readable color display and long battery life that supports extended training and multi-day use, plus built-in music storage so workouts can be phone-free. For runners who value daily suggested workouts, recovery insight and race planning, this smaller-sized model delivers the key features needed for consistent training and accurate tracking.

Key Features

• Slim color display: A full-color always-on screen is easy to read in direct sunlight while remaining light on the wrist for long runs and everyday wear.
• Extended battery life: Up to 12 days in smartwatch mode and up to 26 hours of GPS time means fewer midweek charging interruptions and reliable support for long training blocks.
• Music on board: Store up to 500 songs and link wireless headphones for phone-free listening during workouts and runs.
• Adaptive training guidance: Daily suggested workouts and training status update after each session to help athletes train smarter and track recovery.
• Health and recovery insights: Morning report and HRV status summarize sleep, heart rate variability and a daily suggestion to help plan the day.
• Race and performance tools: Race widget, completion time predictions and Garmin Coach plans help prepare for specific events and track progress.

Who It's For

The Forerunner 255S Music is best for dedicated runners and multisport athletes who want a compact watch that still offers advanced training metrics like running power (with optional accessories), multiband GPS performance and adaptive daily workouts. Its music storage and long battery life make it well suited for people who prefer to leave their phone behind on runs.

Less suitable for users who need an oversized screen or those who expect flawless wireless connections in every environment, as connectivity reviews are mixed for some Bluetooth earbuds. Also, triathletes who require built-in cycling power sensors or advanced swim lab features may prefer other specialty devices.

Pros & Cons

Pros

• Compact, lightweight design with a bright, always-on display that stays readable in sunlight.
• Very strong battery performance in both smartwatch and GPS modes for multi-day use.
• Onwatch music storage for up to 500 songs enables phone-free listening during training.
• Robust training features including adaptive daily workouts, race predictions and HRV-based morning reports.

Cons

• Connectivity with wireless earbuds can be inconsistent for some users, producing mixed experiences.
• Some advanced running metrics require additional accessories sold separately for continuous measurement.

Specifications

Display	Always-on full-color, sunlight readable
Sizes	Available in 41 mm and 46 mm sizes (smaller model featured)
Battery life	Up to 12 days smartwatch mode, up to 26 hours GPS mode
Music	Store up to 500 songs and play via wireless headphones
Training features	Daily suggested workouts, training status, race widget, Garmin Coach plans
Health tracking	Sleep, HRV status, recovery time and performance monitoring

Our Verdict

The Forerunner 255S Music is a strong choice for runners who want a compact, feature-rich smartwatch that balances long battery life with music storage and serious training tools. It offers excellent value for athletes focused on improving performance and recovery, though anyone relying on flawless Bluetooth connectivity or needing built-in accessory sensors should check compatibility first.

Frequently Asked Questions

Can I listen to music without my phone?
Yes, the watch can store up to 500 songs and pair with wireless headphones so you can run phone-free.

How long does the battery last during GPS use?
Expect up to 26 hours in GPS mode, which is suitable for long runs and extended activities.

Does the watch provide daily workout guidance?
Yes, it offers adaptive daily suggested workouts and training status that update to reflect your recent performance and recovery.