Have worn a watch almost constantly since I was a child. I tried going watchless for a while on the false notion that my phone would do the job. There is simply no comparison in convenience for knowing the time between the two. Watch is vastly superior. I came to this conclusion before phones are enormous dinner plate sized affairs. Back when "candy bar" style phones were actually smaller than candy bars (Sony Ericsson T-910.)
That's relevant, because, it also acts as an enormous endorsement of how useful the watch can be in every other "glance" like information conveyance situation, and I already have a handful of things that have me yanking my phone out of the pocket or bag 100 times a day. The watch will absolutely be useful to me.
As for battery life, I'm not concerned. It will be a minor addition to my daily ritual. I already plug my phone in next to my bed every night, out of habit, even if it's 100% charged. I will buy a very convenient stand/hanger for the watch and charge it in that. It has influenced my decision about which band style to prefer, though.
I also believe that AW "2" or "3" or whatever, next few iterations coming will have almost no difference in capability or size, but, will have increased battery life. That may partly come in the form of a faster CPU so it will be touted both ways, but, the reality will be that battery life will be a priority for this product for a while. At any rate, 18 hours is for the 38mm. I'll probably end up with the 42mm which Apple says experiences longer battery life. 18 hours is already longer than my typical day, and an underestimate based on third party hands-on experience.
TL;DR Yes I wear a watch constantly and no I'm not worried about the battery life.
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I wear a watch daily and even mandated to wear one at work. I work 12 hr shift and most of the time it is longer (plus commute time). I never worry about battery life because I wear a mechanical watch. I when I switch watches and not wear one for a few days, I do have to set the time and date again.
I am not really concerned about the AW battery life, unless it dies after 13 hrs. I'm sure in the early life if will last all day, but after a while I know it won't last as long, just like any cell phone.
I hope the battery can be changed out without costing too much.
In reality it will probably be SHORTER in the beginning, because you will keep playing and futzing with it more than necessary
🙂 Also, lithium ion batteries need a number of full charge/discharge cycles to reach peak operating capacity which will typically remain at peak for about 500 charge cycles. SO yeah, it'll eventually lose some runtime, but, probably not until it's nearly two years old at which point you'll be bored of it so you won't use it half as many times a day
🙂