I have had my 38 mm apple watch now for around four days, and I am very happy with it, apart from one major thing.
When I decided which watch to order I never even considered the larger 42 mm model. This was because I have small wrist, and I thought that as a voice over user I would have nothing to gain with the larger screen. however, I didn't consider the battery life difference.
I think its very understandable that I didn't think there would be much of a difference between the battery life of the 38 and 42 mm watches. After all Apple has been totally silent about the battery life of the 42 mm model, only saying the following.
"Apple Watch battery performance claims are based on test results from the 38mm Apple Watch. A 42mm Apple Watch typically experiences longer battery life."
The battery claims that the above quote is referring to say that the 38 mm watch can, on average, make it 18 hours. I have found that this is more or less true, although I would say my battery has died closer to sixteen hours in.
So what am I disappointed by if the 38 mm model has made it close to Apple's official claims? I am disappointed that Apple has not given the specific battery life of the 42 mm model, because I believe it last significantly longer.
I do not have any first hand experience with the 42 mm model, but from everything I have read it seems to really run laps around the smaller model when it comes to battery life.
The reviewer at the link below has claimed battery life ranging from twenty five hours to thirty two hours.
Apple Watch battery performance claims are based on test results from the 38mm Apple Watch. A 42mm Apple Watch typically experiences longer battery life.
Of course everybody uses the watch differently, and one person can't compare battery life results to another, but every person I have read about who has the 42 mm model seems to have consistently much longer battery life.
I would give you more scientific numbers on this, but they are not out there right now, which is really the whole problem. I am not mad that the 38 mm battery does not last as long as the 42; after all the larger watch has a larger battery. I am just upset that Apple did not better inform users who were deciding which watch to get.
In conclusion I am not suggesting that anyone avoid the 38 mm watch, I am simply saying that battery life is probably a larger thing to consider then you might have originally realized, when weighing the choice of which size to get.
I intend to visit the Apple store next week and see the 42 mm first hand to decide if the larger size could work on my wrist. If I am happy with the larger size I believe I will exchange my smaller watch, even though it will mean that I will probably have to wait months before I get the larger option. Just to make it clear I am happy, over all, with my watch, and I am really going to miss it if I have to wait for the 42 mm model.