Fitbit Charge 2 Battery Replacement

ID: 142159

Description: Use this guide to replace a worn-out or dead...

Steps:

1. Before starting, take your Fitbit Charge 2 off the charger and power it down.
2. Remove the watch band on both sides.

3. Heat an iOpener and apply it to the touch screen for two minutes.
4. The screen is not glued down, but the heat helps to loosen the touch screen assembly from your watch.

5. Insert an iSesamo into the gap between the touch screen and the watch assembly on the top left corner.
6. Slide the iSesamo along the left edge to the bottom left corner.

7. Slide the iSesamo around the bottom left corner.
8. Slide it along the edge to the bottom right corner.

9. Slide the iSesamo around the bottom right corner.
10. Keep sliding it along the right edge to the top right corner.

11. Slide the iSesamo around the top right corner.
12. Slide it along the top edge to the top left corner.

13. Place the iSesamo under the top left corner.
14. Feel free to reattach the watch band for this and the next step for a better grip.
15. Pry up the touch screen assembly by twisting the iSesamo sideways to create a gap and unhinge the plastic clips which are holding the screen in place.

16. Place the iSesamo under the top right corner.
17. Pry up the touch screen assembly by twisting the iSesamo sideways to create a gap.

18. Insert a spudger into the gap on the top edge of your Fitbit Charge 2.
19. Use the spudger to pry up the touch screen assembly.
20. Do not remove the touch screen assembly all the way yet—it's still connected to the motherboard.

21. Carefully fold the touch screen assembly in the direction of the bottom edge.

22. Use a pair of blunt nosed tweezers to remove the black sticker which covering the touch screen connector.

23. Use the pointed end of a spudger to open the ZIF connector by pushing up the black flap.

24. Pull the touch screen flex cable straight out its socket.
25. Remove the touch screen assembly.

26. Remove the two Phillips screws securing the motherboard cover:
27. One 2.5 mm screw
28. One 2.8 mm screw

29. Use a pair of blunt nose tweezers to remove the motherboard shield.

30. Use the pointed end of a spudger to pry up and disconnect the heart rate monitor sensor flex cable.

31. Use an opening pick to pry up and remove the motherboard which is holding the battery.

32. The battery is mildly glued to the motherboard.
33. Slide an opening pick underneath the battery to cut the adhesive.
34. Don't try to remove the battery all the way yet! It's still connected to the motherboard.

35. The next steps require desoldering the two battery cables from the motherboard.
36. Use this picture as reference for resoldering during re-assembly or make your own photo if the cable order differs in your model.

37. Use a soldering iron to desolder the first battery cable from the motherboard.

38. Use a soldering iron to desolder the second battery cable from the motherboard.

39. Remove the battery.
40. Do not reinstall a damaged or deformed battery, as doing so is a potential safety hazard. Replace it with a new battery.
41. Make sure the battery cables are long enough to solder them onto the motherboard before installing new adhesive to the battery.