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Introduction

This guide will help you replace a Fitbit Alta battery. If you have let your Fitbit die for long period of time, have not been following proper charging practices, or have owned your Fitbit for multiple years, the battery may be at the end of its life. In this case, the battery may not turn on, hold a long charge, or stay on when unplugged.

This process involves exposing the internal components of the Fitbit, desoldering and disconnecting the old battery, and soldering in a new battery.

Caution: Fitbit can become dysfunctional if soldering is done incorrectly, and will not work if the wires are attached to the wrong ends or if the motherboard is exposed to excessive, prolonged heat.

The process will require a T2 Torx Screwdriver, tweezers, razor blade, soldering iron, and solder.

  1. At one of the corners, push the tweezers in between the metal casing and screen cover. Use the tweezers to wedge the two pieces apart. Repeat on all four corners. This step requires a large amount of force. Using a razor blade to slide along the length of the screen cover/metal casing may help. Once the screen is removed, the Fitbit should look like the third image.
    • At one of the corners, push the tweezers in between the metal casing and screen cover. Use the tweezers to wedge the two pieces apart. Repeat on all four corners.

    • This step requires a large amount of force. Using a razor blade to slide along the length of the screen cover/metal casing may help.

    • Once the screen is removed, the Fitbit should look like the third image.

    Io per togliere lo schermo ho usato la punta del taglierino facendo attenzione a non scalfirlo, seguendo con la lama tutt’intorno perché la cornice sotto è incollata.

    Claudia Spatafora - Reply

  2. The screen is partially attached to the motherboard with adhesive, so gently slide the tweezers underneath the entire screen to detach it, then lift it up. The screen is made out of thin glass, so make sure not to be too rough. After this step, the screen should still be connected to the motherboard through a small black hinge. This piece should NOT be removed/cut.
    • The screen is partially attached to the motherboard with adhesive, so gently slide the tweezers underneath the entire screen to detach it, then lift it up.

    • The screen is made out of thin glass, so make sure not to be too rough.

    • After this step, the screen should still be connected to the motherboard through a small black hinge. This piece should NOT be removed/cut.

  3. Once the screen is lifted, the motherboard will be exposed. Remove the  center screw holding the motherboard in place with the T2 Torx screwdriver.
    • Once the screen is lifted, the motherboard will be exposed.

    • Remove the center screw holding the motherboard in place with the T2 Torx screwdriver.

  4. The motherboard is held in place by two small hooks. With the screen opening to the left, use your finger to gently press down and slide the motherboard to the right. Once free from the clips, lift the board up. The motherboard is still attached to the casing by some wires, so make sure not to pull it completely out. The motherboard is still attached to the casing by some wires, so make sure not to pull it completely out.
    • The motherboard is held in place by two small hooks. With the screen opening to the left, use your finger to gently press down and slide the motherboard to the right. Once free from the clips, lift the board up.

    • The motherboard is still attached to the casing by some wires, so make sure not to pull it completely out.

  5. Once the motherboard is lifted, you will use the tweezers to detach the old battery (located in the bottom left) from the casing. Note that the clear yellow section is a part of the battery. The battery is held into the casing with adhesive, so it will need to be lifted away in the same fashion that the screen was lifted away in step 2. Once the battery is removed, lift the motherboard and attached components completely out of the casing.
    • Once the motherboard is lifted, you will use the tweezers to detach the old battery (located in the bottom left) from the casing. Note that the clear yellow section is a part of the battery.

    • The battery is held into the casing with adhesive, so it will need to be lifted away in the same fashion that the screen was lifted away in step 2.

    • Once the battery is removed, lift the motherboard and attached components completely out of the casing.

  6. A soldering iron must be used to melt the solder connecting the battery to the motherboard.
    • A soldering iron must be used to melt the solder connecting the battery to the motherboard.

    • A guide of how to solder can be found here: How To Solder and Desolder Connections

    • Cut the wires of the new battery to an appropriate length and strip the ends of the wire casing with the razor to expose the wire.

    • Solder the new battery to the motherboard.

    • Be sure to connect the correct wires to the correct points on the motherboard, or else device will not work.

    If after replacing the battery the Fitbit still doesn’t work (except when connected to the charging cable) check the supply fuse (markedF1) just below the red square in the above picture next to to the red battery lead pcb connection. The fuse may have blown when your old battery went short circuit.

    I temporarily jumpered it out after replacing the battery and the Fitbit now works :-)

    Unfortunately I have no information as to the current rating of this fuse?

    If you know please add this info for me and others to benefit :-)

    dave.bullock - Reply

    You don’t need to add more solder. Just break the old connections right at the solder joint and melt the solder slightly. Then slide the new wire into the melted solder and let it harden. Voila!!

    Eric Anderson - Reply

    I replaced the battery on my Alta, only to discover it would only work while plugged in, but not when unplugged. My Alta worked fine before the new battery, but would only last a day or two days. I read Dave Bullock’s comment above. I had nothing else to lose with my tiny paper weight, so i placed a tiny drop of solder across F1 (the same side as the battery terminals). Nothing came to life right away. I put it all back together, plugged it in, unplugged and and Bingo! It worked!…. Thank you DAVE! I agree shorting fuses is not the best practice… but I figure this is 4.25 volts device and I am now enjoying the device again. I would replace the fuse if I could … but this thing in TINY.

    I really tried hard to not touch the battery wires to the board or case. I felt I succeeded, but with a blown fuse… I must have failed. Be careful to not let those wires touch anything.

    Darren Platt - Reply

  7. Repeat steps 3-5 in reverse order.
    • Repeat steps 3-5 in reverse order.

    • The screen may have reattached itself, preventing you from completing step three (securing the motherboard). If so, repeat step 2 and then proceed to step 3.

    • You will need to lightly press down on the motherboard while screwing it in, or it will not make contact.

    • To reattach the screen, line it up to the metal outline and gently press it down. You may want to clean the screen with a cloth to remove any dust or fingerprints before proceeding to the next step.

  8. Replace the screen cover, making sure to match the gold plate on the cover to the gold hook located on the right upperhand corner of the motherboard. This step requires a bit of force, so be sure to use both hands to balance your force evenly across the screen cover, or else you will risk cracking it.
    • Replace the screen cover, making sure to match the gold plate on the cover to the gold hook located on the right upperhand corner of the motherboard.

    • This step requires a bit of force, so be sure to use both hands to balance your force evenly across the screen cover, or else you will risk cracking it.

  9. Plug your Fitbit into its charger to turn it back on and charge up the new battery, if needed.
    • Plug your Fitbit into its charger to turn it back on and charge up the new battery, if needed.

    Quelle pile avez vous utilisé ?

    cfauchon - Reply

    FANTASTICO! ho acquistato la batteria su ebay e il Kit completo con il micro saldatore + multimetro Digitale il tutto a pochissimi euro! e son riuscita DA SOLA ad aggiustare il mio Fitbit! MERITO DI BENJAMIN E DEI SUOI COLLABORATORI :)))) complimenti per le precisissime spiegazioni.

    ps: sono anche fiera di me! GRAZIE MILLE per avermi dato questa gioia e soddisfazione…sperando che la batteria duri un bel po eh eh!

    Claudia Spatafora - Reply

Conclusion

Your Fitbit should now hold a charge.

15 other people completed this guide.

14 Comments

How about screen replacement? Is there a replacement part for that?

Tom Hernandez - Reply

Hi, Tom.

I haven’t seen anything about replacement screens online. To the best of my knowledge, Fitbit doesn’t offer replacement parts for any of their devices.

Emily Parcell -

My Fitbit Alta HR has no center screw. The battery connects from the end of the mother board and there are two very small screws on the other end. It is virtually impossible to solder the new battery in without shorting to the two hold down clamps. Virtually Junk…

Keith - Reply

Maybe try getting a few really small pieces of electrical tape to cover the clamps?

Benjamin Hufendick -

Keith,

Your Fitbit may be an Alta HR, rather than an Alta. I have the same situation you do. The PCB in the HR is different, and in the center has a very small flat-flex cable to the HR sensor below. If you are very careful, you can fold back a small piece of tape holding the flex flex in place (look closely, it is very hard to see), and then you can gently disconnect the HR sensor. The connector lifts straight up, perpendicular to the surface of the PCB. After you have disconnected, you can remove the two screws and slide out the screen, PCB, and battery assembly as a single unit. The HR sensor will remain behind in the case. I would recommend using a plastic tweezers for this process rather than metal, as if the PCB is powered you could damage it in the process.

I took some photos, but I don’t believe I can post them here.

jmmull - Reply

jmmull,

Thank you for describing the differences between Alta vs Alta HR. The main guide was helpful with pictures. I was able to spot the differences with your detailed description. I successfully completed the battery swap for Alta HR. I found a heat gun very handy for removing the screen cover and prying the LCD screen. Note that the solder points for the battery are next to the hooks on the frame where you hook the PCB into for installation.

ganbare6 -

Thank you so much for this excellent guide! All went perfectly!

Daniel D - Reply

A bit more tedious than expected, smallest device I have ever worked on, but the toolkit I purchased from Amazon was perfect. Instructions were 95% accurate as it pertained to the inner workings, mine had two screws at the end of the motherboard holding it in, instead of a single one in the middle. But the written instructions were clear enough to help me adjust. Great Job!

John - Reply

Amazon says the battery is only compatible with the Alta not the HR. My HR battery says 46 mAh and the battery on Amazon is 36 mAh. Has anyone actually used the Alta 36 mAh in the HR?

Thanks!

David Kroc - Reply

hi guys i accidentally disconnected the little ribbon cable connected to the screen

i tried to re-connect it but i failed

can you please give me some tips on how to re-connect it correctly?

Regards

SNAKE TISON - Reply

This may be late, but hopefully useful for others. The connector is the ZIF type where the black bar on the socket needs to be flipped up (use a 2mm flathead screwdriver or similar tool to flip it). There was also a small foam pad and black tape on the ribbon cable itself, I had to remove this from the cable because it was interfering with reinsertion. Be careful when removing the tape not to tear the ribbon. Once removed, the adhesive was not reusable for me, but seems to function fine without it. With the socket opened, you can get the cable lined up and just barely put in holding the device in one hand, and the screen in the other. To get it firmly seated, I flipped the screen over the circuit board like it would normally go which created the normal “bend” in the cable. I then used closed tweezers to gently push the bend toward the circuit board to effectively push the connector all the way in. I’ve used this method about 4 times already, and it works every time.

Russel Kubes -

I replaced the battery on my Alta, only to discover it would only work while plugged in, but not when unplugged. My Alta worked fine before the new battery, but would only last a day or two days. I read Dave Bullock’s comment above. I had nothing else to lose with my tiny paper weight, so i placed a tiny drop of solder across F1 (the same side as the battery terminals). Nothing came to life right away. I put it all back together, plugged it in, unplugged and and Bingo! It worked!…. Thank you DAVE! I agree shorting fuses is not the best practice… but I figure this is 4.25 volts device and I am now enjoying the device again. I would replace the fuse if I could … but this thing is TINY.

I really tried hard to not touch the battery wires to the board or case. I felt I succeeded, but with a blown fuse… I must have failed. Be careful to not let those wires touch anything.

Darren Platt - Reply

my fitbit alta is not working properly after unplug timing is not display in screen

what can i do pls help me… sukhpreetwithsevenseas@gmail.com Kindly revert me in this email id

seven seas - Reply

For Alta HR owners:

Hi, i’ve successfully repaired my Alta HR with this tutorial, even if it is actually intended for a normal Fitbit Alta.

The procedure is the same excepted the order of the steps 3 to 6.

At step 3, before unscrewing the 2x torx 2 screws, (Alta HR has 2 screws instead of one) let them in place.

1/ Unsold the 2 contacts with the red and black wire.

Otherwise you gonna get blocked for pulling the battery out because of the sensor ribbon connected in the middle of the MB.

2/ Unscrew the torx screws

3/ Replace the battery (only 7€ for me in 2021)

4/ Screw the two screws back to the MB.

5/ Resold the contacts and the wires: black on -, red on + (basically step 6)

Follow step 7.

IMO it’s easier to do it this way for the Alta HR because of this new ribbon. But the whole procedure is basically the same.

Tangogow - Reply

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