Nope. When a CEO of a publicly held company -- not to mention one with one of the largest market caps in the world -- talks about an unannounced key spec like battery life he is not in "sales mode," but "expectations management mode."
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And how Apple is expecting you to use it IS how its designed to be used. Anything else and the user has been given notice. This is nothing new. Apple gives use scenarios for all its products when reporting expected battery life, and usually it's on the conservative side.
Honestly I don't disagree with you.
Personally I'm not really keen on hearing this expected timeframe, but that's me.
I would rather have some numbers based upon usage.
What we have to do, in reality is, listen to the CEO tell us one thing, and then wait for user reviews to find out the facts.
iPad lasts say 10 hours officially, but then why does your boys iPad need recharging after he's been playing say Grand theft Auto since he got up and it's only lunchtime. What happened to the so called promised 10 hours?
I'm making those numbers up, but you see what I mean.
Car fuel consumption is the biggest lie, I think we all know that, and it's actually been proved how much of a lie. Nothing to do with Apple, but just saying we can't always accept official numbers.
The only issue, which will be a real issue is how the device is used.
It's know than Apple are holding back what the devs can do right now.
So, the watch will last, let's say, all day when using the type of Apps apple are allowing the devs to write NOW.
That alone does really put up the question of, well how will this day long battery life alter once the devs can do more?