Garmin Fenix 7X Solar Teardown (Non Destructive)

Thank you

Nice to see what's inside. I wonder how many dust particles will show up behind the glass after putting it back together  Unless that space is sealed off from the rest of the watch of course.

Thank you,an  extremely informative read...

Saved the link.. 

There is a mistake in the informations. AG3335MN doesn't support L5 band for GPS, GLONASS. Only AG3335M has it. Unfortunately the link for MN version doesn't work anymore at the manufacturer. But all screenshots are here:

forums.garmin.com/.../poll-multi-frequency-positioning-activation-in-basic-f7

Any signs if ecg readings might be possible through software updates (like the venu?)

Do not hesitate to contact the blog writer :-)

The battery is labeled with 4.45V (end-of-charge voltage).

I know that normally Lithium-Polymer batteries have a max. charge voltage of 4.2V ... 4.25V but never heard of as high as 4.45V. I wonder which battery technology allows that high end-of-charge voltage without ageing very quick? Maybe if one tops up his charge frequently to 100% it may result in degreeing battery life more as usual

Display module is glued to bezel, so it can be said it's sealed. There is no empty area to let dust particles to the front of the display. I have never seen any dust particle in this watch or previous ones I torn down.

8860776 said:

The battery is labeled with 4.45V (end-of-charge voltage).

I know that normally Lithium-Polymer batteries have a max. charge voltage of 4.2V ... 4.25V but never heard of as high as 4.45V. I wonder which battery technology allows that high end-of-charge voltage without ageing very quick?

the 4.2 volt cut off you mentioned refers to a 3.7V battery. As you can see on the picture in the linked blog, a 3.87V battery is installed. 3.87V batteries have a cut off voltage of 4.45V. The information on the pictured battery is therefore completely correct.

As an example you can also see a 3.87V battery here. Also 4.45Volt cut off : 

l think you misunderstood my posting, because I didn`t doubt the information on the pictured battery.

But I wondered about the battery technology, as I wrote.

The answer is, that it must be a LiCoO2 battery. Which leads to interesting facts, as the advantages and disadvantages of that technology:

1. High energy density (both volumetric and gravimetrtic)

2. Large number of mechanical cell sizes available

3. High voltage - a single cell replaces three NiCd or NiMH cells

4. Active development - significant investment into further improvements

5. No memory effect

6. Very low rate of self discharge

 1. Fast moving technology means that products are replaced regularly

2. Protection circuits required to prevent overcharge and over discharge

3. Moderate discharge capability make the technology unsuitable for high power applications

4. Performance at low temperatures can be poor due to higher internal resistance

5. Limited cycle life (300-500 cycles)

6. Transportation regulations require cells and batteries to be tested