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This guide will teach someone how to take out the battery in the Polar M400 and replace it with a working one. A damaged battery could be due to lack of charge or submersion in water more than 30 meters. It could also be due to battery age and various malfunctions. Over time, excessive and wear can lead to battery damage. The Polar M400 has an internal, rechargeable battery. You can charge the battery over 300 times or two years before a notable decrease in its capacity. The number of charge cycles also varies depending on use and operating conditions. Once the battery is replaced, follow local waste disposal regulations and do not dispose of this product as unsorted municipal waste.
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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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crwdns2935267:0crwdne2935267:0Tweezers$4.99
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Apply an upward pressure to the holes until the locking pins release.
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Use precision tweezers to remove the pins that connect the face with the strap.
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Once the pins are released, the old wrist strap should snap off.
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Use the T5 head on the iFixit screwdriver to unscrew the four screws on the back of the watch’s face.
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Gently remove the backing from the watch.
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crwdns2935267:0crwdne2935267:0Tweezers$4.99
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Use tweezers to gently pry the golden sensor away from the battery.
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Remove battery using the plastic opening tools.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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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?
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
where can i buy a batery for my polar m400? Link please. Thanks
Once the battery is changed, the M400 does not work. Do you have to press any combination of keys?
