Its all you can do once the battery has gone flat until you get back to a wall socket, unlike a normal watch or pebble that you can wear for a week whilst camping or holiday without having to worry about charging .
i like the "idea" of apples watch, that battery life is just a blocker to me, it takes the watch from a useful "smart watch" to "an expensive jewellery accessory)
maybe one day apple will spend some of their billions on new and improved battery tech instead of ways to make their products into annual disposable items.
I cannot believe that if Steve Jobs was still at the helm that he would have thought a single day battery life was good enough, it feels to me the watch has been rushed to market to appease share holders (something Steve didn't give two hoots about) and because the apple brand needed something "new" to keep share prices up and they couldn't innovate on the existing product lines
I want the apple of 2008-2011 back, that was the sweet spot, they produced good solid products, and were not driven by a need to have Form of Function that seems to be evident in the Johnny Ive/Tim Cook lead firm.