Fit Model for Fitbit Versa 2 FB507
Part Number for Fitbit LSSP281928
CS-FTB507SL Category Smartwatch
Capacity 165mAh 
Type Li-Polymer 
Voltage 3.85V /0.62Wh
Dimension 28.00 x 17.60 x 2.80mm
 

 package include:

1* 165mAh  battery