For Fitbit Charge 5 FB421 Activity Tracker
3.87V 65mAh/0.252Wh
For Fitbit Charge 4 FB417 Smart Watch
3.85V 71mAh/0.273Wh
For Fitbit Charge3 FB409 Smart Watch
For Fitbit Charge 2 Fitness Watch FB407
3.7V 63mAh
For Fitbit Versa 3 (FB511) & SENSE (FB512) Watch
3.85V 260mAh/1.001Wh
For Fitbit versa 2
3.85V 165mAh/0.63Wh
For Fitbit Blaze FB502 Smart Fitness Watch
3.7V 167mAh
For Fitbit Ionic Smartwatch
3.8V 1100mAh
For Fitbit Ionic Smartwatch Ionic Battery
3.8V 195mAh
For Fitbit Versa FB504 FB505 Smart Watch
3.85V 150mAh