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Polar M400 Watch Battery Replacement

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  1. Polar M400 Watch Battery Replacement, Wrist Strap: passo 1, immagine 1 di 1
    • Insert a standard paper clip into the holes on both sides of the watch that connect the watch's face with the wrist strap.

    It may be easier to push the pins out in one direction. Unfortunately, I do not recall which direction was easier…

    Nathan Gelderloos - Replica

  2. Polar M400 Watch Battery Replacement: passo 2, immagine 1 di 2 Polar M400 Watch Battery Replacement: passo 2, immagine 2 di 2
    • Apply an upward pressure to the holes until the locking pins release.

    • Use precision tweezers to remove the pins that connect the face with the strap.

  3. Polar M400 Watch Battery Replacement: passo 3, immagine 1 di 1
    • Once the pins are released, the old wrist strap should snap off.

    • Simply lock the new wrist strap into place.

  4. Polar M400 Watch Battery Replacement, Battery: passo 4, immagine 1 di 1
    • Use the T5 head on the iFixit screwdriver to unscrew the four screws on the back of the watch’s face.

  5. Polar M400 Watch Battery Replacement: passo 5, immagine 1 di 2 Polar M400 Watch Battery Replacement: passo 5, immagine 2 di 2
    • Gently remove the backing from the watch.

  6. Polar M400 Watch Battery Replacement: passo 6, immagine 1 di 2 Polar M400 Watch Battery Replacement: passo 6, immagine 2 di 2
    • Use tweezers to gently pry the golden sensor away from the battery.

    • Remove battery using the plastic opening tools.

    this shows how to take the battery out; what about replacing it nd securign the ‘electricity leads’ of the new battery to the watch?

    Yonatan G - Replica

    Thanks, very clear straight forward steps

    mohamed elmosalamy - Replica

    this shows how to take the battery out; what about replacing it nd securign the ‘electricity leads’ of the new battery to the watch?

    même remaque que jonathan

    pas assez de précision sur la remise en place des connecteur de la nouvelle batterie

    François Collet - Replica

    Bonjour François, as tu réussi à remonter la batterie?

    Thierry Grandjean -

    Very strange you haven't completed the procedure.

    John Kirk - Replica

    It says 'To reassemble your device, follow these instructions in reverse order' How difficult is that? So, put battery in, carefully fold contacts back, etc, etc....if that is not obvious, then please do not attempt this at all.

    Mark van der Giezen - Replica

Conclusione

To reassemble your device, follow these instructions in reverse order.

Altre 15 persone hanno completato questa guida.

25 Commenti

Hello, thanks for the details !

The most tricky part: find the right spare part. I can’t find a replacement battery that could fit the original dimensions with reasonnable capacity.

Do you have any lead?

Vincent - Replica

In case if anyone is still looking for the spare part I have just replaced my M400 battery with this one: https://www.aliexpress.com/item/10050045...
Replacement instructions were detailed enough to get my watch to work again.

Roman -

Bonjour

Pourriez-vous m’indiquer ou je peux acheter une batterie compatible ou originale

Merci à vous

ducellier - Replica

where can i buy a batery for my polar m400? Link please. Thanks

lsmi_21 - Replica

Once the battery is changed, the M400 does not work. Do you have to press any combination of keys?

lojobis - Replica

You have to connect charging cable.

Xavier Gernaey -

I have made the process with the same battery and once finished it does not work anymore, is there any combination of keys to start it?

I recommend not doing it until you know it

lojobis - Replica

After the procedure, just plug the USB to your computer with Polar Flow running and it will restart your watch!

Keven Bronsard -

I read somewhere it won't start unless you plug the charger. Hope this helps.

Léo Beaudoin -

https://www.allsystem.cz/

I bought a connector USB there… Maybe can be interesting for someone else…

manuel caudera - Replica

I had same problem =

“I have made the process with the same battery and once finished it does not work anymore, is there any combination of keys to start it?

I recommend not doing it until you know it

lojobis - 23-02-2019”

fabio andrade - Replica

After the procedure, just plug the USB to your computer with Polar Flow running and it will restart your watch!!!

Keven Bronsard -

Could the issue be no electrical contact with the battery when reassembling? The contacts don’t seem easy

LeftoverScrew - Replica

Polar won’t sell spare parts so where can I buy a replacement screen or a replacement front case for the M430?

Olivier Grand - Replica

After the procedure, just plug the USB to your computer with Polar Flow running and it will restart your watch…

Keven Bronsard - Replica

Where could i buy the micro usb connection for the M400?

floydian1973 - Replica

where I can buy the battery?

pierodire - Replica

The Polar M400 original battery is an EVE 3.7V 190mAh lipo battery cell (352826) with dimensions: 3.5mm (thickness) x 28mm (height) x 26mm (width). Unfortunately this battery is discontinued and is very difficult to get. However, you can use this instead:

352525 160 mAh cell for 6€

It has 30mAH less but the dimensions fit (3.5mm x 25mm x 25mm) . Since it comes with leads, the only thing you would have to do to adapt it is either expose the connectors, or connect these leads with the PCB connectors.

joseacr2000 -

Oppure questa 190mAh 3.8V

https://it.aliexpress.com/item/400061109... 9359-4111-b6ad-6391504d1b12 & ws_ab_test = searchweb0_0, searchweb201602_1, searchweb201603_55

alaska.m - Replica

Ciao, vedo che sei italiano. Sei riuscito a rimpiazzare la batteria da te indicata senza problemi? Mi consigli di provarla?

elia occhiuzzi -

Bonjour Merci pour les tutos

J’ai une polar M 400 et j’ai changé le connecteur USB .Je voudrais savoir comment on referme la connection sur la nappe du connecteur ?

Cordialement AM

Andre Matrat - Replica

Hi. I had changed the original baterry for this

https://nl.aliexpress.com/item/400061109...

190 Mah 3.8V Batterij Core Voor Polar M430 M400 Gps Sport Horloge Nieuwe Li-Polymeer Oplaadbare Accumulator Vervanging + Spoor Code

but my flash light in my Polar watch doesen’t worked give no lights more.

I made somthing wrong maybe? Can sombody help me?

Thanks

Lionel - Replica

I have made the process with the same battery and once finished it does not work anymore. also connecting to polar flow does not makes any difference

bowoo king - Replica

Battery measurement give me 4V

bowoo king -

Depending on the model of your Polar device you can either change the battery yourself or you need to have it changed by a Polar-authorized service center that only uses Polar-approved components. With every battery change, Polar performs a full periodic and water resistance check.

https://support.polar.com/us-en/support/...

Harry C - Replica

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