Fitbit Charge 4 Advanced Fitness Tracker with GPS, Swim Tracking & Up To 7 Day Battery

£149.995
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Fitbit Charge 4 Advanced Fitness Tracker with GPS, Swim Tracking & Up To 7 Day Battery

Fitbit Charge 4 Advanced Fitness Tracker with GPS, Swim Tracking & Up To 7 Day Battery

RRP: £299.99
Price: £149.995
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Both have a similar rectangular design with a grayscale OLED touchscreen, and a replaceable band that wraps around your wrist. There are also 20 different workout options you can select from during setup on the companion Fitbit app, including specific exercises like bike riding. Fitbit upgraded the Charge 5 with a bright OLED colour display that replaces the Charge 4’s grayscale screen. While you'll still need your phone —sorry, no onboard music storage — this should make it easier for you to skip tracks and change playlists. Heart rate zones are broken down by percentages in the app, making it easy to see just how long you spent in each zone.

Your goal is to spend 150 minutes in each heart rate zone (fat burn, and cardio and peak combined) during the course of a week. Active Zone Minutes considers the intensity of your exercises, not just the duration, which means it can be a much more effective metric for people who are attempting to stay fit. The app explains that, “during deep sleep, your muscles relax and repair themselves, and during REM sleep your memory and mood are refreshed as you dream. The Charge 4 can switch between the on-device GPS and your phone’s GPS signals to optimize battery life.

For example, if you're well rested and have lots of energy, the app may suggest a tough run, but if you're more tired it might suggest you try some active recovery with a gentle yoga session. Many other apps fitness provide you with an estimate of spent moving, but these measurements are often connected to footsteps rather than heart rate and are therefore less accurate for indoor activities. The SpO2 sensor records your blood oxygen levels while you sleep and helps provide an estimated oxygen variation graph in the sleep section of the Fitbit app. NFC allows you to use the Fitbit Charge 4 for contactless payments through Fitbit Pay, and you can control the Spotify app on your phone via Bluetooth.

Not only does it keep the GPS chip (packed into a case that's 10% thinner), but it also has an EDA (electrodermal activity) stress monitor, as seen in the Fitbit Sense, plus an ECG (electrocardiogram) sensor for checking your heart health.It's a monochrome OLED touchscreen, with a relatively low resolution that limits the amount of workout data that can be displayed at once, and makes checking app notifications tricky as you can only see a small snippet of text. This could prove frustrating if you like to keep your workouts varied, and exercise both indoors and outside. Among the new features, Fitbit has added Spotify controls (you can’t download tracks to the band itself, however) and Fitbit Pay.

Read on to find out all the key differences between the two fitness trackers, and choose the right one for you. The Charge 4 is the first of Fitbit’s fitness trackers to have this feature, but it is available on the Versa, Versa 2, and Ionic. The Fitbit Charge 5 is the latest model and is a very impressive fitness tracker, but its predecessor, the Fitbit Charge 4, might be better suited to your needs – particularly if you're on a tight budget. You get one point per minute of moderate exercise and two points for every minute of vigorous exercise.

My experience so far is that using the GPS for short bursts of activity (20 to 30 minutes) every day gives around four days of use. Do a mild, ten-minute workout mostly in your fat-burning heart-rate zone (zone 3, normally), for example, and you’ll earn ten Active Zone Minutes towards your daily 30-minute target; up the intensity to your cardio and peak heart rate zones (usually defined as zones four and five) and you’ll get double credit for any time spent in those zones.

The lack of a color screen isn't much of a drawback in general use, but does make the various watch faces less attractive than we'd like, and means those packed with more data can be tricky to read due to their numerous shades of gray.You'll then be asked to update the device's firmware; a process that takes a few minutes and requires it to be kept close to your phone. These Fitbit Charge 4 sport straps come in many different colours so there's always a colour available to match your style or outfit. While sleep tracking has been available on Fitbit devices since the original Charge, the fourth-generation model features some sleep tools that were previously only available on the more expensive Versa 2 smartwatch. Tap the button or raise your wrist to wake the screen, then swipe right to access the device's various menus and settings. I'm PCMag's managing editor for consumer electronics, overseeing an experienced team of analysts covering smart home, home entertainment, wearables, fitness and health tech, and various other product categories.



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