Fitness and sleep tracking band that also displays caller ID information when paired with a smartphone app. Released November 2014.

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What kind of screwdriver do you need to open the back?

Hi I'm trying to fix my Fitbit charge, I'm pretty sure that is not working anymore because a water damage. If anyone knows can kind of screwdriver do you need to put apart the screws from the back I will be very thankful.

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I am wondering that too! Did you ever find out? I have exact issue where I went in the lake and it died after that.

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I've since verified that it is indeed a T3 screw. My Charge fell apart, and my wife's Charge randomly stopped working. No water damage, it just died.

I thought it was the battery, so I opened both up to swap the batteries, to find it wouldn't be quite that easy...the batteries are soldered to the board. And the wires are tiny.

Earlier this evening, I got around to de-soldering the batteries so I could swap them, only to find my wife's Charge still didn't work, even with a known good battery. It was just dead.

So, I reattached the battery to my board, and installed that into my wife's band. Since it was different internals, I had to do a factory rest in order to pair the Charge with the wife's account.

Just a note, once you take the screws out, you'll likely need a spudger to finish removing the back. It was a bit of a PITA.

Also, once I got mine apart, I found that some of the screw holes in band's frame were broken. When I put it back together, I actually had to glue it shut.

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Fitbit customer support are really good, i've had a couple of similar problems with my Charge HR, and after 5mins of talking to the online chat support, they have sent me replacements. Might be worth a try if they break again!

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See if this guide helps: Fitbit Flex Teardown

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That answer is for a flex, not a charge.

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According to this Charge HR teardown, it's a T3 Torx.

Fitbit Charge HR Teardown

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This must be a new post of the teardown for the HR model? I didnt see that before when I posted the question thank you!

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Same one as the bottom of an iPhone 6, very small star shaped one, not sure of the name sorry.

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Luis Blanco will be eternally grateful.
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