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Body Battery overnight when watch is not worn

My "body battery" number in GCM always has a value starting from the point I put my 945 on my wrist after waking up (I do not wear it while sleeping). Where does it derive this starting value from? It's not simply picking up where it left off the night before as the values are always different.

For example, last night the value was at 96 (I assume percent?) when I went to sleep, yet when I awoke from a very restful full night of sleep this morning, the value had dropped to 73.

Coincidentally I do wear a Vivosmart 3 when I sleep (it's my daily tracker) and just using the above example from last night the stress readings it recorded were very low all night so at least from that perspective I seemed to have a restful night of sleep as well.

So I'm confused how the Body Battery is getting my starting numbers from the 945 each morning.

0 f|33tStA over 5 years ago

when you exchange your watches, especially with a watch without bodybattery, then body battery measurement makes no sense, for sure, if you use your FR945 only for sport, it's foreseen as a 24hour measurement

0 f|33tStA over 5 years ago in reply to f|33tStA

you can also read this, measurement during night is very important:

https://www.garmin.com/en-US/blog/fitness/5-reasons-your-body-battery-running-low/

0 badbri over 5 years ago in reply to f|33tStA

Thanks but I'm not sure I understand. I'm not "exchanging" a watch, I wear my vivo 24/7 as my daily tracker and just take my 945 off when I sleep.

My specific question is how does the 945 measure Body Battery overnight when it's not being worn.

0 KOKKETIEL over 5 years ago in reply to badbri

After reading the above link, the obvious answer is that it can not measure your body battery when not worn. There is probably some TrueUp data sharing happening, though.

0 Dr Phil over 5 years ago

If your VA is your preferred activity tracker (PAT) data will be transferred to your 945 when synching the watches to your phone or Garmin Express that will likely be used to estimate BB readings on your 945.

0 badbri over 5 years ago in reply to Dr Phil

My VA does not have Body Battery capability.

0 badbri over 5 years ago in reply to KOKKETIEL

Obviously it's not measuring a value when not worn, but it's definitely coming up with some value then upon waking and putting the device on. Is it simply making some evaluation of my body battery status based on that initial reading? If so, the reading generally doesn't make any sense (after a long and restful night showing extremely low stress (from my VA) the value is lower than it was when I went to sleep).

0 Dr Phil over 5 years ago in reply to badbri

Made an edit that might explain it better.

0 badbri over 5 years ago in reply to Dr Phil

Thanks that makes more sense, but as posted above the scores generally aren't sensible considering what my VA is measuring overnight.

I'm probably making too much of it, "body battery" is probably just a fun little number to look at, but the Garmin marketing blog post (that the earlier poster linked to) is what initially sent me down this path of thinking about it. The post talks about sleep's impact on the readings specifically.

I suppose I could wear it one night and see what happens.

0 Dr Phil over 5 years ago in reply to badbri

badbri said:
I suppose I could wear it one night and see what happens.

If you do, change it to be your preferred activity tracker.