Fitness Tracker Gadgets

Fitbit Charge 4 Review: A Smart Fitness and Activity Tracker

Fitbit Charge 4

The Fitbit Charge 4 looks precisely almost like the leaks ahead of its official announcement teased. It is significantly the look and feels of the Charge 3 with built-in GPS, Spotify control, and other sophisticated features commonly found on Fitbit’s smartwatches such as the Fitbit Pay, app notifications, smart wake, and a SpO2 sensor that have caught everyone’s attention. The $149 tracker possesses a battery life of up to seven days or up to five hours with an uninterrupted GPS use.

Fitbit Charge 4 Design 

Image Source: Android Central

The Fitbit Charge 4 looks sleek and measures less than half an inch at its thickest point. The styling of the Special Edition grabs all the attention and comes with a reflective granite or black woven band. It also features a classic black flexible plastic band that is extremely helpful for sweaty workouts. The two small buttons on the back of the tracker are used to release one band and snap on a new one. 

Just like its predecessor, Charge 4 has a grayscale touch screen that measures about one inch diagonally. Fitbit Charge 4’s screen is easy to read when you’re outdoors in the shade. But in the sun, you have to squint a little for a better display. 

The screen shuts off rapidly to save battery life by default, though you can modify how long it stays on by the Screen TimeOut setting. Tapping the button on the left side or by giving your wrist a little shake, or tapping the screen itself will wake up the device. 

Fitbit Charge 4 allows you to customize the tracker with various watch faces, depending on your mood or your look. For instance, the Mod Clock Date option will show you the present time, date, and also your step count for the day. It also displays your Active Zone Minutes and heart rate. 

The interface is simple and uncluttered. Fitness stats can be viewed by swiping up from the clock face. You can also view other stats, including hourly steps, heart rate, distance covered, calories burned, etc. Swiping left from the clock face allows you to get access to on-device apps. At the same time, a swipe down on the clock face displays the notifications.

Image Source: Pinoy Fitness

Fitbit stated that Charge 4’s battery lasts up either to seven days or up to five hours while using GPS. The Dynamic GPS feature of the Fitbit Charge 4 lets you preserve battery life.

Fitbit Charge 4 is water-resistant to about 164 feet. It is advised to dry the tracker after wearing it in water to prevent skin irritation. It is also advised to frequently clean the watch and your wrist, particularly after working out or sweating.

For a precise heart rate reading, the Fitbit Charge 4 must be tight enough so that it wraps the wrist perfectly and does not move, but not too tight that it leaves a mark on your wrist.

Fitbit Charge 4 Features 

Intuitive Touchscreen

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Fitbit Charge 4 allows you to comfortably see your stats in sunlight, at night, or anytime, due to a large touchscreen and backlit display that adjusts to various lighting conditions.

Notifications & Apps

You can stay connected with call, calendar, and smartphone app alerts, text notifications, and beneficial apps such as weather and timer. You can also send rapid replies to messages on Android only.

Sleep Stages and Score

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Fitbit Charge 4 tracks your time in light, deep, and REM sleep stages and provides you with a nightly Sleep Score in the Fitbit app. This helps you understand your sleep quality and guides you to work toward better rest.


It is water-resistant to 50M. Fitbit Charge 4 also automatically tracks swim workouts and can be worn either in the shower, pool and beyond.

Spotify Control

Fitbit Charge 4 increases the intensity of your workout by allowing you to control music and browse playlists and podcasts.

Heart Rate

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You can use Fitbit Charge 4’s 24/7 heart rate to accurately track calorie burn, optimize workouts, and uncover health trends.

Heart Rate Zones

Using Fitbit Charge 4, you can get real-time stats of your workout on the screen. This lets you know whether you’re in Fat Burn, Cardio, or Peak zone, so you can measure the effort up or down in line with your goals.

Fitbit Pay

You can load your credit and debit cards to your Wallet in the Fitbit app, then use Fitbit Charge 4 to tap and pay for purchases on the go, either at transit stations, stores, etc. Although it’s not available with every transit system and banks. 

Daily Dashboard

You can see daily activity stats in one place with a daily dashboard that reveals your steps, calories burned, sleep, heart rate, etc. using Fitbit Charge 4.

Resting Heart Rate

Fitbit Charge 4 allows you to record your resting heart rate, track heart rate trends gradually, and follow your health and fitness progress.

Workout Intensity Map

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You can get a significant understanding of your effort during outdoor workouts with a map in the Fitbit app, which reveals when and how long you were in each heart rate zone.

Active Zone Minutes

Fitbit Charge 4 allows you to know the heart rate zone you’re in to measure if you’re working hard enough to reach your goals.

Built-In GPS

You can use built-in GPS to check your pace and distance on the Fitbit Charge 4, during outdoor runs, rides, hikes, and more, then check a map of your workout in the Fitbit app.

Long Battery Life

Fitbit Charge 4 has a battery life of up to 7 days and up to 5 hours when using GPS. Fitbit Charge 4 allows you to do more with less charging, but it varies with use and other factors.

Goal-Based Exercises

Fitbit Charge 4 allows you to exercise during your preferred workouts to set a goal for every workout and check the real-time progress of your effort on screen.

Clock Faces and Accessories

You can even customize your Fitbit Charge 4 by selecting the clock face and switching out the classic band for accessories in leather, woven, sport styles, and more.  

All-Day Activity Tracking

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Fitbit Charge 4 tracks all-day activity such as steps, distance, floors climbed, Active Zone Minutes, and calories burned to reveal how every part of your day moves you closer to your goals.

Reminders to Move

You can keep yourself on track towards achieving your goals with fun, on-screen reminders that support you to move throughout the day using Fitbit Charge 4.

Wireless Sync

Fitbit Charge 4 automatically syncs to most common iOS and Android devices to reveal your stats, trends, and progress on your Fitbit dashboard.

Mobile App

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In the Fitbit app, you can set goals, track progress, and get an entire picture of your health and fitness, from nutrition and hydration to exercise and sleep. 

Fitbit Charge 4 Specs

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What’s Included:

  • Fitbit Charge 4
  • Classic wristband (both small and large)
  • Charging cable

What’s Included In Special Edition:

  • Fitbit Charge 4
  • Woven reflective band (both small and large)
  • Classic wristband (both small and large)
  • Charging cable

Sensors and Components

  • 3-axis accelerometer
  • Optical heart rate monitor
  • GPS
  • Vibration motor
  • NFC chip for Fitbit Pay
  • Altimeter

Battery and Power

  • Battery type: Lithium-polymer.
  • Charge time (0-100%): Two hours.
  • Radio transceiver: Bluetooth 4.0.

Note: Battery life and charge cycles may vary with use, settings, and other factors. Therefore, the actual results will also vary. 


  • It can save seven days of detailed motion and heart rate data, minute by minute.
  • It can measure heart rate at 1-second intervals during exercise tracking and at 5-second intervals all other times.
  • It saves daily totals for the last 30 days.

Environmental Requirements

  • Operating temperature: -20° to 60° C
  • Maximum operating altitude: 8,535 m


  • Syncing range: Up to 9m
  • It syncs automatically and wirelessly to most common phones and tablets using Bluetooth LE wireless technology.
  • It lets you control music through Bluetooth LE on Android and iOS devices.
  • Some features such as smartphone notifications may require Android 7.0+. 
  • Syncing to mobile devices requires Bluetooth LE and an internet connection.
  • It can sync with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later.


  • 35.8mm l x 22.7mm w x 12.5mm h


Entirely, the Fitbit Charge 4 has some top-notch features and is a good upgrade from the Charge 3, while the Fitbit app displays quite a lot of complex information in an accessible way. Enthusiastic sportspeople will desire a long-lasting battery for GPS use and more granular metrics, but as a fitness tracker for general health, the Fitbit Charge 4 is amazing and beneficial.

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