It is safe to say that I am FUMING. I was already suspicious of the impact on battery endurance after the update to software version 7.4, but this is serious. Today I visited my local pool for my first swim since March, and the watch died just 3 minutes after starting the activity - having removed it from the charger less than an hour earlier. Now admittedly I do not recall what the battery state was when I took it off the charger, but I have used this kit for 18 months without missing a beat. I feel an urgent rollback to 7.3 coming on.