I turn on my Gear S at 6am every morning, and use it all day before recharging at night. I have done nothing to the watch recently which would affect the battery life, but it now runs down to 15% by 5pm, whereas before it would still have 60-70% left by that time. I want to replace the battery, and haven't found anything on line that even suggests that I can do that. Is it possible to replace the Gear S battery? If so, how?