Sports Technology

Garmin Forerunner 645 Review – Running Watch With Music!

Written by William

Garmin Forerunner 645 Review – Running Watch With Music!



Batteries Required: yes

Dimensions: 1.7 x 0.5 x 1.7 inches

Weight: 1.44 ounces

Sport Type: running;golf;yoga;cardio;strength training;swimming;hiking

Style Name: With Music

Running is more than just exercise – it’s a performance. Forerunner 645 Music has the tools to help you put on an outstanding show every time you lace up your shoes. It features on-device music storage so you can run with your favorite tunes and contactless payments that let you buy what you need without missing a beat. With all those features, plus advanced running dynamics and performance monitoring tools, this GPS running watch is the instrument you need to refine the performance.

This new Garmin Forerunner 645 watch looks certain to be the replacement to the hugely popular Forerunner 235.


The Garmin Forerunner 645 is perfect for 95% of serious athletes, fitness enthusiasts, runners and anyone else looking to take their training to the next level.

It’s packed with Fitness Tracking features such as 7 Day Training Load, 4-week Training Status, and VO2 Max.

Other great features include contactless payments and internal memory to store over 500 songs …

I personally use the Garmin Fenix 5 as my daily training watch.

I am hoping they might find a way of adding the Forerunner 645’s internal music store and contactless payments to the Fenix 5. There are not many features I’d miss by switching down to the Forerunner 645.

Key functions MISSING from the Forerunner 645 PRESENT in the Forerunner 935 and Fenix 5 are:

  • No multisport support – eg Triathlon or Duathlon mode
  • Support for Power Meters (cycling)
  • FTP (cycling power related performance metric)
  • Open Water swimming metrics
  • Lactate Threshold prediction
  • Golf courses

A full list of differences can be found here at (compare Forerunner 645, Forerunner 935 & Fenix 5)

In short, if you don’t play golf, are NOT interested in power metrics (cycling) and don’t partake in multisport events like duathlon and triathlon – the Garmin Forerunner 645 is for you …

Memory for 500 songs

Transfer music directly from your computer and add it to your playlist.

To listen to the music you need a pair of Bluetooth headphones – we recommend for value for money the JBL Reflect as shown below.

A full list of compatible Bluetooth headphones is provided on Garmin’s support pages. With the Forerunner 645, it’s now possible to listen while you train – FREE from your smartphone.

For Premium subscriber’s to the Deezer platform – you can synchronize your playlists directly to the 645 ads free.

Garmin Contactless Payment

Other key new features added to the Forerunner 645 are Garmin’s contactless Payment System.

Garmin Pay Ready contactless payment method lets you make convenient payments with your watch so you can leave your cash and cards at home

Battery Life

  • Smartwatch Mode: Up to 7 days
  • GPS mode without music: Up to 14 hours
  • GPS mode with music: Up to 5 hours

Clean, stylish lines

We loved the Garmin Forerunner 235 – one of the best GPS running watches of the last 5 years. But there’s no getting away from the fact that it was a bit “plastic” looking.

The new Garmin Forerunner 645 has similar lines to the Vivoactive 3 with stainless steel bezel and Gorilla Glass 3 adding to the quality look and feel


Garmin Training Status

I have been using the Garmin Fenix 5 for the last 4 weeks and Training Status is the BEST serious fitness innovation since built-in heart rate monitoring. No more guessing if you’re undertrained or overtrained. The Garmin Forerunner 645 will tell you precisely what your personal training status is.


  • Lovely design
  • Rapid GPS
  • Recent Spotify support


  • Poor battery life


If the price is not an issue, buy this watch. I have been using it for more than two months and I really like it. From a design standpoint, it’s really well designed: both functionally and aesthetically.
There are some quirks to be ironed out still, but the amount of information you get about your runs, the extreme customization of the screens, battery life and the fact that it works as a great 24/7 activity tracker justify its price.

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