Chosen Solution
The button that takes me down in the menu is stuck in depressed mode, making sure the screen always shines at maximum power. This means that my battery life is only a few hours. how can you solve it?
If you guys needed an answer still, I used a bit of bluetack pressed down hard on the button and it managed to pull the button out. Hope this helps. Not a long term fix but works short
It is VERY easy to open this watch. The battery and button contacts are attached to the back plate. Only four little screws to remove once the strap has been removed. I suggest opening, careful cleaning, and checking of contacts. Then re-assemble. See here for how to open: Polar M400 Watch Battery Replacement
Hi Patrick, if you feel confident enough, this is what i did to free up the buttons. Removed the outer case, you’ll need star screwdrivers, then undid the circuit board screws ( Philips-head) and removed the unit completely for access, I didn’t bother to disconnect the battery. Once out I have a Jewellers eye glass as the parts are exceedingly small. Depressed the sticking button and removed the small securing clip holding the button in place. Make sure you’re doing all this on a white linen cloth as the parts are very easy to lose. Once the clips removed the button comes out. There you’ll find a metal washer, a rubber gromit and a small spring. I just gave everything a clean and the spring a slight stretch before putting everything back in reverse. the tools I used were: Star screwdriver Philips-head screwdriver thin nosed tweezers A cup to hold the screws Jewellers eye piece let me know if this helps. Michael
I wasn’t keen on opening it up. I’ve had the bottom left button jam twice and each time I’ve used beard trimmer oil and it’s sorted it out after a few hours.
