Specs and features Fitbit Charge 2

TypeSmart watches and bracelets
Release date 2016
Display 1.5" OLED
Battery Li-pol 30 hours
Dimensions 225x129x2506mm. 36.8gram
Communication Bluetooth
  • Pulsometer
  • Accelerometer
  • Sleep Analysis
  • Altimeter


Wristband sizes

S 140-170 mm
L 165-206 mm
XL 206-236 mm

Customer reviews Fitbit Charge 2

Amazon.com 14866 4.2
Yandex Market 5 4.0
Walmart 415 4.4
BestBuy 9863 4.6

Applications Fitbit Charge 2

Fitbit Fitbit, Inc. 3.9
Fitbit Fitbit, Inc. 3.6


Review Fitbit Charge 2 - The main functions

The fitness tracker Fitbit Charge 2 is a multifunctional wristband that includes an accelerometer and a heart rate monitor.
This device enables:
  • To define the steps number and distance covered;
  • To measure heart rate constantly;
  • To analyze the time and sleep stages;
  • To calculate the number of calories burned and training time;
  • To remind about inactive periods;

Pros Fitbit Charge 2

Fitbit Charge 2 is a modified version of Fitbit Charge HR, and in all respects it exceeds its predecessor:
  • Precise sensors: heart rate monitor, pedometer, altimeter
  • Large bright display shows a lot of useful information
  • Excellent application and detailed statistics from Fitbit
  • Identifies sleep time well and quite good at sleep stage determination
  • Excellent motivation for fulfilling goals
  • A wide variety of kinds of sport

Cons Fitbit Charge 2

We have tested the fitness wristband Fitbit Charge 2. Of course, this wristband is much more functional than cheaper models like Xiaomi Mi Band 2, but for this cost it has too many drawbacks.
  • Does not recognize the removal of the wristband
  • No good water resistance (only splash protection)
  • Short battery life (only 5 days)
  • Not very convenient charging (no charging on the magnet)
  • Relatively heavy weight for a fitness wristband
  • There is no smart alarm (only a silent alarm clock)
  • Black and white screen is not touch-sensitive
  • Limited notifications from your phone

Additional advantages Fitbit Charge 2

  • The ability to customize the appearance of the clock and information shown on the display
  • Excellent accelerometer that measures steps and floors climbed accurately, even when there is no hand movement
  • Accelerometer distinguishes the movement of a hand from steps
  • It is one of the most accurate wrist heart rate monitors (with a tight fit of the wristband)
  • During the entire testing period, the maximum heart rate deviation is only 7bpm.
  • Easy to fasten and adjust the length of the wristband, firmly fits on the arm

Disadvantages or what you need to know about Fitbit Charge 2

Before buying it is worth becoming familiar with the following shortcomings which can become critical for exacting buyers:
  • The heart rate monitor does not recognize the removal of the wristband and continues to show strange results. This is strange enough for the device of such a cost, while the sensor itself measures quite accurately
  • ‘’Fictitious" results obtained during the removal spoil all the statistics of the pulse
  • If the wristband does not fit tightly, it shows data far from reality, so it is usually difficult to trust the wristband or it is necessary to wait until the data stabilizes
  • When being removed it periodically adds extra minutes or even hours of training and sleep time
  • Very roughly determines REM sleep, often confuses it with a light sleep (like all wristbands)
  • During fastening, the strap periodically pinches the skin, which is sometimes quite unpleasant.
  • An additional stub on the belt makes stretching quite difficult
  • Not very convenient device for charging, considering that most devices are already using magnets.
  • The brightness of the display is not adjustable, and when viewing at night the backlight is too bright
  • At night, the wristband accidentally turns on the display from arm movement and can Interrupt sleeping

Errors and problems of operation Fitbit Charge 2

  • It should be borne in mind that if you wake up for 2 minutes to drink water, then the wristband will most likely count about 10 sleepless minutes, even if you immediately fall asleep;
  • There are some synchronization problems from time to time, periodically during 10 minutes it can not update sleep data, even after forced synchronization.
  • Somehow periodically the wristband displays sleep data in the old way, as it was before the firmware update, which is not informative enough for those who are used to see beautiful graphs from Fitbit.

Operating instructions Fitbit Charge 2

Taking into account that the main disadvantages of the device are some problems with recognition of its removal, the following actions will be useful:
  • To obtain more accurate statistics, it is necessary to minimize the time of wristband absence on the arm;
  • Charge the device while taking a shower, this will minimize the inaccuracy of the data and will eliminate the need to charge additionally the device;
  • Put the charger in a visible place to remember to put on the device
  • For those people who are afraid of harm from Bluetooth, you can turn off the function of constant synchronization
  • The manufacturer declares that the device is protected from splashes, nevertheless to use Fitbit Charge 2 in a shower or during rain is not recommended

Testing and specification Fitbit Charge 2

To display the following data on the wristband Fitbit Charge 2, we have tested the device for more than 40 indicators and collected data of more than 200 characteristics. At the same time, the figures may differ depending on the production lot, product variation and firmware.

Analogs Fitbit Charge 2 - Comparison

Brand Fitbit Xiaomi Huawei Honor Amazfit
ModelCharge 2 Mi Band 2 Band 3 Arc
Minimum price USD
User rating 4.4 4.6 4.3 3.9
Functionality 4.9 3.4 4.1 2.6
Sesors accuracy 4.2 3.9 3.2 3.8
Pulsometer 3.8 4.3 2.9 4.5
Accelerometer 4.4 4.3 2.7 4.2
Sleep Analysis 4.5 3.1 4.0 2.9
Bluetooth 4.0 LE 4.0 LE 4.2
Connected GPS
Material sensor Stainless steel Plastic; aluminum Plastic Aluminum
Material strap Elastomer Thermoplastic elastomer Polyurethane Elastomer
Item width 225 mm. 15.7 mm. 16.5 mm. 19 mm.
Item height 129 mm. 40.3 mm. 43 mm. 11 mm.
Item depth 2506 mm. 10.5 mm. 10.3 mm. 245 mm.
Item weight 36.8 gram 19.4 gram 18 gram 20 gram
Replaceable straps
Strap dimensions S;L;XL
Buttons 2 1 1 1
Package weight 300 gram 90 gram 104 gram 116 gram
Package width 112 mm. 10 mm. 100 mm. 73 mm.
Package height 53 mm. 3 mm. 40 mm. 55 mm.
Package depth 200 mm. 10 mm. 160 mm. 135 mm.
Display size 1.5 Inches 0.42 Inches 0.91 Inches 0.42 Inches
Display backlight
Display colors 1 1 1 1
Display width 32 px 72 px
Display height 128 px 40 px
Pixel density 147 ppi 196 ppi
Auto adjust brightness
Water Resistant WR20 IP67 WR50 IP67
Temperature minimum 14 °C -20 °C
Temperature max 113 °C 70 °C
Battery type Li-pol Li-pol Li-pol Li-pol
Battery capacity 70 mAh 100 mAh 70 mAh
Battery life - Waiting 720 hours 480 hours 720 hours 480 hours
Battery life - Tested 15 hours 10 hours
Magnetic Charger
Input voltage 5 volt 5 volt 5 volt 5 volt
Input current 45 mA
Charging time 1-2 hours 2 hours 1.5 hours 0.5 hours
Android version 4.4 4.4 4.4 4.4
iOS version 7 8 9.0
Windows 10 8.1
Mac OS 10.6
Incoming call
Incoming message
Call ID display
Digital faces 10 2 2
Analog-digital faces 1
RAM 256Kb 128Kb
ROM 1Mb 8Mb
CPU ARM Cortex-M4 Dialog DA14681
Flash 16Mb
Chipset SmartBond DA14681
Operating System Proprietary OS Proprietary OS Proprietary OS Proprietary OS
Support updates
USB cable
Unlock identity
Find My Device
Smart alarm
Silence alarm
Rotate to switch
Dynamic heart rate
Training mode
Reminder to move
Guided breathing sessions
Calorie consumption
Distance covered
Active Minutes
Food log
Water log
Weight log
Scan barcode
Applicatio feature
Add friend
Share results
Weight training
Compatible apps 18 3 3
Google Fit
UP by Jawbone
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