Garmin Instinct 2 Solar Review: Weeks of Battery for Runners, Riders, and Hikers

Introduction

The Garmin Instinct 2 Solar sits at the top of the Instinct range, and at around £389 it is priced as a serious multisport watch rather than a casual fitness tracker. The headline feature is solar charging, which Garmin uses to extend time between charges rather than replace them.

Across daily wear and a mix of running, cycling, and hill walking, the watch held up well. A full charge is rated at up to 28 days, and the battery still showed a healthy margin even after a full day of activity tracking.

This review covers what the watch does well, where it asks you to make a decision, and who should consider it.

Who this product is for

The Instinct 2 Solar is built for people who want one watch for several activities rather than a separate device per sport. It covers running, cycling, hiking, and everyday wear, with a full set of training metrics behind each.

Because the battery stretches to weeks rather than days, it suits multi-day trips and wild camping where charging is not practical. The solar layer adds a top-up in daylight, which helps most when the watch spends long hours outdoors.

It is also a smartwatch. Paired over Bluetooth it delivers phone notifications, and it supports contactless payments through Garmin Pay.

It is worth being clear about the positioning, too. This is Garmin’s entry point into a full multisport activity watch, yet it arrives packed with functionality that would have looked premium only a generation ago.

Battery Life and Solar Charging

The battery is the strongest argument for this model. Garmin rates a full charge at up to 28 days, and after a full day of activity tracking the watch still reported around 17 days remaining. That is the kind of margin that turns a charging cable into an afterthought on a weekend or a week-long trip.

Solar charging works as a supplement. It prolongs the time between charges when the watch is exposed to daylight, but it is not a replacement for plugging in, and buyers should treat it that way.

Training and Activity Tracking

Across the activities tested, the data screens were easy to follow without stopping. During a run the watch shows the current lap, heart rate, the fitness zone you are working in, and an estimate of how long the battery will last in GPS mode. Heart rate zones run through easy, endurance, tempo, and threshold bands, alongside VO2 max.

Laps can be set by distance. A 5 km lap triggers a beep and briefly freezes the screen so the lap time is readable at a glance. After each session the watch reports training effect, recovery time, and a summary that syncs to Garmin Connect and can be pushed on to Strava.

Everyday Smartwatch Features

Between activities the watch behaves like a smartwatch. The main watch face carries sunset time, daily steps, heart rate, Body Battery, and recovery information, and it can show sleep data and upcoming calendar events once those are set up. Smart notifications come through from a paired phone.

Body Battery is the metric worth understanding before buying. It reflects how much energy the watch believes you have available, based on activity, stress, and recovery, and it feeds into the recovery guidance shown after harder sessions.

GPS Accuracy and Navigation

GPS lock was quick in the conditions tested, typically within a couple of minutes, and it does require being outdoors with a reasonable view of the sky. Once locked, the signal held through runs, rides, and a long hill day without dropping out.

For navigation, a completed hike is displayed as a map that can be zoomed in or out, alongside an elevation profile of the route. On a 15.34 km walk with roughly 1,400 m of descent, the recorded track and elevation data lined up with the effort of the day, which included a maximum heart rate of 161 BPM.

Things to consider before buying

The price is the first thing to weigh. At £389 this is not an inexpensive watch, even though it sits at what is effectively Garmin’s entry point for a full multisport device.

Settings matter more than they should. Auto pause, for example, needs to be switched on if you want average speed to reflect moving time rather than total time. Without it, a walk with stops records a misleading average.

Solar charging also deserves realistic expectations. It extends battery life in daylight, but it does not remove the need to charge.

And if you already own a watch from Garmin’s premium Fenix line, the day-to-day training and navigation experience is close enough that an upgrade is hard to justify on features alone.

Buying advice

Buy the Instinct 2 Solar if you want a single rugged watch for running, cycling, and hiking, and if battery life measured in weeks matters more to you than a colour touchscreen or the lightest possible case.

If solar charging is not a priority, it is worth comparing the rest of the Instinct 2 range before deciding, since the solar layer is what places this model at the top of the line. If what you actually want is step counts and notifications, a simpler and cheaper tracker will cover that.

Conclusion

The Garmin Instinct 2 Solar delivers on the two things that matter most for outdoor use: fast, dependable GPS and battery life measured in weeks rather than days. Activity tracking is comprehensive, the smartwatch features are there when you want them, and the solar layer provides a genuine top-up on long days outside.

At £389 it is a considered purchase rather than an impulse buy, but for anyone who wants one watch to cover both training and multi-day trips, it makes a strong case.