38mm battery life not that good?

By thatsmega.net I am on my 2nd day using the 38mm sport and I am not impressed with the battery.
Yesterday I managed 13 hours and it went completely flat – it did not even enter power saver mode.
Today I have tried to play with the watch less and feel I have barely used it and after 9 hours I’m only on 52% – There are still 7 hours until bed time!
I don’t understand these people going to bed after 14-16 hours and still having 50% or so…
I have noticed a lot of fake activations with wrist detection – maybe this is the cause?

Source: MacRumours