I wrote on my blog about my thoughts on Apple Watch after two weeks with it. The most common comment I come across is how people worry about the watch’s battery.
Battery life: Battery life information can be relegated to a glance instead of occupying a space on the watch face. It’s not turned on for any watch face by default. I put it in to help me gauge the average battery life. When I remove the watch to charge it just before I sleep, the battery is usually around 40-45%. On days of heavier usage, I ended up with 35-40% battery. I believe that concerns about the watch’s battery life are unfounded. You’ll only run out of battery if you forget to charge it, or if you are fiddling with the watch all day.
The watch charges very quickly. It took less than an hour to go from 35% to 100%. So even if you really forgot to charge the watch before you sleep, you can still get it fully charged in the morning.