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mdelrossi

macrumors regular
Original poster
Jun 22, 2005
123
71
I was having some issues with my iPhone battery. So I Turned off Bluetooth on iPhone and battery life went up on both the phone and the watch.

I’ve got to do more investigations, but somethings up.

iPhone 6s with a replaced battery from Apple.
Apple Watch Nike 4
mdr
 

musicpenguy

macrumors 68000
Oct 29, 2006
1,823
733
I prefer to operate that way just because the watch behaves better for me using WiFi/LTE - Bluetooth I only use when I need to sync new apps, activity data, or something else that only talks over BT. Otherwise watch stays on WiFi/LTE.
 

musicpenguy

macrumors 68000
Oct 29, 2006
1,823
733
No Bluetooth on the watch I believe is the most battery efficient way to run - that’s not why I’m doing it. WiFi on is very power efficient on the other hand.
 
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tromboneaholic

Suspended
Jun 9, 2004
3,706
3,024
Clearwater, FL
The watch will use Wi-Fi if the phone's bluetooth is off. If your phone is normally far away from the watch (in a bedroom while you are in the kitchen) bluetooth will consume more energy than Wi-Fi.

If no Wi-Fi connection is available, the watch will continue using energy as it searches for the phone using bluetooth.
 

ipaddaro

macrumors regular
Dec 6, 2014
231
52
The watch will use Wi-Fi if the phone's bluetooth is off. If your phone is normally far away from the watch (in a bedroom while you are in the kitchen) bluetooth will consume more energy than Wi-Fi.

If no Wi-Fi connection is available, the watch will continue using energy as it searches for the phone using bluetooth.

but priority is bluetooth or wifi? what if the iphone is near and both are connected to the same wi fi (with bluetooth on on iphone)?
 

tromboneaholic

Suspended
Jun 9, 2004
3,706
3,024
Clearwater, FL
but priority is bluetooth or wifi? what if the iphone is near and both are connected to the same wi fi (with bluetooth on on iphone)?
From the comments I've read, the watch has to get pretty far away from the phone to switch from Bluetooth to Wi-Fi.

OP has an iPhone 6s, which supports Bluetooth 4.2. Apple Watch Series 4 and newer iPhones since iPhone 8 support Bluetooth 5, so the results OP sees might vary based on location (is there Wi-Fi) and device (Bluetooth 5 is more efficient).
 

ipaddaro

macrumors regular
Dec 6, 2014
231
52
From the comments I've read, the watch has to get pretty far away from the phone to switch from Bluetooth to Wi-Fi.

OP has an iPhone 6s, which supports Bluetooth 4.2. Apple Watch Series 4 and newer iPhones since iPhone 8 support Bluetooth 5, so the results OP sees might vary based on location (is there Wi-Fi) and device (Bluetooth 5 is more efficient).

but if you have bt 5 on AW and not on the iphone, you will loose the low consumption benefits of bt 5? or only the iphone will drain faster?
 

tromboneaholic

Suspended
Jun 9, 2004
3,706
3,024
Clearwater, FL
but if you have bt 5 on AW and not on the iphone, you will loose the low consumption benefits of bt 5? or only the iphone will drain faster?
Both devices will use whichever version they have in common.

So an Apple Watch Series 4 would drop down to use the 4.2 protocol when connecting to an iPhone 6s.
 
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ipaddaro

macrumors regular
Dec 6, 2014
231
52
Both devices will use whichever version they have in common.

So an Apple Watch Series 4 would drop down to use the 4.2 protocol when connecting to an iPhone 6s.

i have an iphone 7, maybe this is why i don't get same battery life as others
 

ipaddaro

macrumors regular
Dec 6, 2014
231
52
to be honest, sometimes i quite don't notice any difference during night with airplane mode, and day when it is connected to iphone... it's less at night, but considering that i don't use it.. 2% drop any hour at night vs. approx 3-4% during day
 

mdelrossi

macrumors regular
Original poster
Jun 22, 2005
123
71
Thanks for the insights. I updated my phone to 12.01, and battery life on both seems better, but not as good with Bluetooth off on the phone.
My phone has been turning off and loosing battery life like crazy, so I’m going to nuke it and do a clean install.

How come there’s no way to turn off Bluetooth on the watch?

Thanks
mdr
 

ipaddaro

macrumors regular
Dec 6, 2014
231
52
Thanks for the insights. I updated my phone to 12.01, and battery life on both seems better, but not as good with Bluetooth off on the phone.
My phone has been turning off and loosing battery life like crazy, so I’m going to nuke it and do a clean install.

How come there’s no way to turn off Bluetooth on the watch?

Thanks
mdr

airplane mode i think.. and then activate only wi fi or lte... not 100% sure it works
 

mdelrossi

macrumors regular
Original poster
Jun 22, 2005
123
71
airplane mode i think.. and then activate only wi fi or lte... not 100% sure it works

Thanks, but then I don’t get messages,calls, weather, etc.

I have it on theater mode all the time, unless I’m exercising.
 

ipaddaro

macrumors regular
Dec 6, 2014
231
52
Thanks, but then I don’t get messages,calls, weather, etc.

I have it on theater mode all the time, unless I’m exercising.

if you activate lte of wi fi i think you will get everything... maybe not phone calls on wi fi, depending on operator
 

Bazooka-joe

macrumors 603
Mar 12, 2012
5,224
3,617
Swindon, England
I have never had to bother with the likes of whether to switch BT/WIFI/LTE on or off. I have everything switched on.
Battery life never drops below 60% on the phone or watch so I just charge them both up overnight. I keep LTE calls on the watch short and brief as that does eat up the battery....far far more than Bluetooth. There was a post on another threat where a guy said that he got an entire day out of his watch on LTE
 
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