Fitbit Charge 2Fitbit Charge 3
Tech specs 
SizeWidth: 21mm
Small: 14 cm - 17 cm in circumference
Large: 16.5 cm - 20.6 cm in circumference
XL: 20.6 cm - 23.6 cm in circumference
Dimensions: 38mm x 18.3mm x 11.8mm
One size (small and large bands included)
MaterialStainless steel casing, elastomer strapBuilt of more lightweight material including an aerospace grade aluminum case and Corning Gorilla Glass 3 display. The housing and buckle are made of anodized aluminum.
ChargingUSB. USB
BatteryLithium-polymerLithium-polymer
Battery lifeup to 5 daysup to 7 days
Water-resistanceSweat, rain and splash proof.5 ATM
Weight36 grams29 grams
SensorOptical heart rate tracker, 3-axis accelerometer, altimeter, vibration motorOptical heart rate tracker, 3-axis accelerometer, altimeter, SpO2, vibration motor
DisplayOLEDOLED full touchscreen, TFT
Screen size3.8 cm696 sq mm,
ColorsBlack, Plum, Blue, Teal, Lavender Rose Gold, Black/Gunmetal Multiple
OtherNFC (Special edition)
Connectivity: Bluetooth, WiFi
Charge 3 stores your stats and data for 7 days in between the times you sync your tracker.
Activity tracking 
StepsYesYes
DistanceYesYes
Calories burnedYesYes
ActivityYesYes
FloorsYesYes
SleepYesYes
Heart rate24/724/7
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPSConnected GPSConnected GPS
Running features
Swimming features
Other Guided breathingGuided breathing, Female Health Tracking
Non-fitness functions 
Smartphone notificationsYesYes
On-board music storage
Connected payYes (special edition)
LTE
Links 
Affiliate link*Amazon | FitbitAmazon | Fitbit
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