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It's generally transferring data using Bluetooth LE so unless you're on call using your Apple Watch it's negligible.
 
Bluetooth has not been a material battery drain for any device for years.
 
Bluetooth has not been a material battery drain for any device for years.
Not true. There are various types of Bluetooth protocols. If you use A2DP profile then the battery drainage is pretty noticeable.
 
Not true. There are various types of Bluetooth protocols. If you use A2DP profile then the battery drainage is pretty noticeable.
I was responding in he context of this thread, which is more in line with just having BT on and having it connected to the watch. In that context (and similar with any other device), BT does not have a material impact. Now, if you have a unique or specific application that is continuously transmitting high volumes of data, and the phone's CPU is busy repackaging those data for transmission, that would be different.
 
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has very minimal, if any, drain on my iPhone 6. i can go all day and the battery on my phone barely impacted just from being paired.
 
As with other responses, you won't notice any drain on battery. I've had Apple Watch since launch day, and a pebble steel watch before that and neither has made any difference to my battery. Also bare in mind I've used several phones over the course of this period; a 5s, a 6, a 6 plus, a 6s and an SE. All perfectly fine with the Watch.

My colleague has just got an Apple Watch and is under the placebo impression his battery has taken a nosedive...even though he's getting about 20 hours out of his 18 month old iPhone 6!

Trust me, you'll be fine
 
Very little Drain out of my iPhone SE. Although my SE is newer and has a strong battery.
 
Additional battery drain to serve data to the watch? Dunno.

But the only reason I'd turn the phone's Bluetooth off is if I'm not wearing the watch -- which means I'll be using the phone more frequently.

I could rightly say that my iPhone battery usage goes UP when I don't have my Watch.
 
Very little drain - especially if not activiely using. When I golf and use the workout app but have very little interaction with the phone for two hours, the battery didn't budge even 1% in two hours. Of course, a few of the betas were draining the iPhone battery pretty bad. Beta 4 seems very solid with the iPhone.
 
It does drain a bit more, but like others said, it's minimal and it's counteracted by using your iPhone less, as you'll spend more time checking notifications on the AW and less time on iPhone.
 
Overall, I've owned a 5s previously and now own a 6s+, and this may sound crazy, but I think having the AW actually improved both phones' batteries, somehow.
 
Overall, I've owned a 5s previously and now own a 6s+, and this may sound crazy, but I think having the AW actually improved both phones' batteries, somehow.
It does because you're turning the iPhone screen on less since you are getting notifications on the watch instead.
 
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