its an iWatch, Apple Watch, Expensive useless jewelry, the first thing i think when anyone that jumps on it being call an iWatch is "ahh, here comes another Apple fanboy who will ignore its MASSIVE and glaringly obvious faults that make it a gimmicky useless piece of tosh"
A single Days battery life, is based on a brand new watch... this will drop off sharply, as it does in all battery products, batteries lose 20-30% of max charge within the first 100 charges, and over half its total charge after 300-500 and with the iWatch that's charged daily well, so you go from the 18hrs max battery life Tim Cook was talking about to 9 hrs by the end of the first year.
but i suppose that as apples plan, in a year they will expect everyone to throw away this years model and buy a new one, and i find that utterly stupid... Its an un-usable , over priced device, compared to either a Normal Watch , or an E-paper smart watch, Had apple gone with a better, less battery intensive draining screen, and had a battery that lasted a week, could monitor sleep patterns, and was generally "useful" i would have been first in line.
Oh.. quick edit about "journalists", i wouldnt trust any of them to give an unbiased review, ever, I look at the tech, and, the batteries that apple use with daily charge regime = dud battery life. I remember when i got my iPhone 3G, 4 and 5, they all had great battery life, for 3 months, after that it fell off a cliff until i couldnt hold a charge past 2 pm, and given the number of people in the office that are all asking for iPhone charge cables every day, that has not been fixed in the iPhone 6 models, and i expect the watches to do the same, because the tech is the same.