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Introduzione

Fitbit charge teardown. It stopped working and was sent a new one so tore old one open...wondering if possible to replace battery (cant find a replacement) as the voltage is 0.

LSSP031420AB lipoly battery.

Questo smontaggio non è una guida di riparazione. Per riparare il tuo Fitbit charge HR, usa il nostro manuale di assistenza.

  1. Remove all four T3 Torx screws. Then "pop" out the electronics by pressing in the reset hole and pushing out the side with a pin.  Use your thumb and push it up towards the wrist band clip (top in this picture).  The unit "slides" up and out.
    • Remove all four T3 Torx screws. Then "pop" out the electronics by pressing in the reset hole and pushing out the side with a pin. Use your thumb and push it up towards the wrist band clip (top in this picture). The unit "slides" up and out.

  2. To access the lipo, remove the two screws above the screen. Pull the circular vibrating motor out and pull out the board. To access the lipo, remove the two screws above the screen. Pull the circular vibrating motor out and pull out the board. To access the lipo, remove the two screws above the screen. Pull the circular vibrating motor out and pull out the board.
    • To access the lipo, remove the two screws above the screen. Pull the circular vibrating motor out and pull out the board.

  3. Image 3a) Two inner screws removed, case gently pried open. Image 3b) Obverse, showing battery glued onto the circuit.  Be careful when prying this up as it could pull off the other connectors. Expanded view showing battery pried out.
    • Image 3a) Two inner screws removed, case gently pried open.

    • Image 3b) Obverse, showing battery glued onto the circuit. Be careful when prying this up as it could pull off the other connectors.

    • Expanded view showing battery pried out.

Hunter

Membro da: 05/03/2016

149 Reputazione

1 Guida realizzata

The band on mine fell apart but I already had one sent for warranty. Min still worked so I took it apart, and while trying to look for a replacement lipo (Searching the number on the battery) i came here... The batter is measuring between 4.1 and 4.2v. There appears to be some sort of protection or charging board taped to the lipo that I think we need to keep if we are to replace the lipo battery.

Randy Fyfe - Replica

I did some more searching, lipo batteries in this voltage are usually labelled as "3.7V" meaning they are a cell with protection pcb that operates up to 4.2v (full charge) down to 3.2V (discharged).

The battery cell in mine measure approx 12mm x 18mm x 2.5mm (WxHxT); with the proection pcb it was a total of about 12mm x 22mm x 2.5mm.

I ahve not found an exact replacement, but did find 10mm x 20mm x 2.5mm cells which should fit... going to order some and see if a bit of soldering will ahve a better running fitbit. :)

Randy Fyfe - Replica

Hola,

I figured at somepoint someone would have a similar problem. I´m no Electric Engineer but I know the battery is a lithium polymer battery. From playing with drones and electric skateboards I know that the standard "nominal" voltage of Lipo batteries in the 3.7V and they should only be charged up to 4.2 V and to extend battery life (at least with my electric skateboards) should not be discharged past around 3.5V. I assume the PCB will take care of the battery charge and discharge. I havent torn into the battery to look at the PCB yet. I´ll post some photos when I get there.

I was curious where you found the small lipo - 10mm x 20mm x 2.5mm cells???? I have been unsuccessful finding replacements based on the product code as well. I did fond some small lipos for older fitbit models. Ususally with lipos this small the batteries are sold with a PCB built in (again from my experience with smaller drones, and I was hoping to find something like that.

Hunter - Replica

I ended up using a combination of the T3, H0.7 and H0.9 bits from the tool kit to get the screws out. Neither was a perfect match, though.

I also added three photos showing the next steps of disassembly.

jimcarson - Replica

One thought is the number on the front is the manufacturer ("LSSP") and dimensions ("031420") of the battery. (For example, see here: http://www.gmbattery.com/product/showpro...)

Using this link, the model "GMB301320" (at 45 mAh) would be close.

jimcarson -

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