Difficulty

Moderate

Steps

6

Time Required

                          9 - 10 minutes

Sections

2

  • Wrist Strap
  • 3 steps
  • Battery
  • 3 steps

Flags

0

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Introduction

What you need

Step 1

              Wrist Strap
  • Insert a standard paper clip into the holes on both sides of the watch that connect the watch’s face with the wrist strap.

Insert a standard paper clip into the holes on both sides of the watch that connect the watch’s face with the wrist strap.

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Step 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.

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.

Step 3

  • Once the pins are released, the old wrist strap should snap off.
  • Simply lock the new wrist strap into place.

Once the pins are released, the old wrist strap should snap off.

Simply lock the new wrist strap into place.

Step 4

              Battery
  • Use the T5 head on the iFixit screwdriver to unscrew the four screws on the back of the watch’s face.

Use the T5 head on the iFixit screwdriver to unscrew the four screws on the back of the watch’s face.

Step 5

  • Gently remove the backing from the watch.

Gently remove the backing from the watch.

Step 6

  • Use tweezers to gently pry the golden sensor away from the battery.
  • Remove battery using the plastic opening tools.

Use tweezers to gently pry the golden sensor away from the battery.

Remove battery using the plastic opening tools.

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

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                                                                                      13 other people completed this guide.

Author

                                      with 2 other contributors 


                    Nicholas Sanders

Member since: 09/28/2017

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Team

                       University of Maine, Team S1-G3, Diaz Fall 2017                        

                                                  Member of University of Maine, Team S1-G3, Diaz Fall 2017 



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                                            6 Guides authored

Vincent - Feb 14, 2018

Reply

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?

ducellier - Nov 11, 2018

Reply

Bonjour

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

Merci à vous

lsmi_21 - Jan 15, 2019

Reply

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

lojobis - Feb 23, 2019

Reply

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

Xavier Gernaey - Oct 10, 2022

You have to connect charging cable.