Also, it took two hours of charge time to go from 10% to 37% charge last night which seems rather slow. I was plugged into a USB 3.0 slot on my PC. My iPhone 5 would have been at or close to 100%.Hoepfully it gets faster over time.
Something might be up with your phone. I have the US AT&T version of the S5 and my Gear 2 Neo is constantly connected and set to sync every 3 hours.
After 3 hours off the charger I'm down to 94% battery. If anything the battery on my Neo is what I'm concerned about. That's at 83% at about 8 hours.