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Battery drain

For a few weeks(I think 3/4) I am experiencing an issue with the battery so it drains instantly from about 20% to 0 and watch shuts down due to critical battery level. I have tried to reset my watch but it happened again.

It looks like battery percentage drops slowly from 100% to let's say 30% but then it speeds up and from 20 to 0 drops within less then 5 minutes. 
I am not sure if it is maybe the issue with current battery percentage indicator, battery is broken or is it an issue with the recent software.

The watch battery even with this issue can last for about a week(with activities) but it is too much unreliable leaving home with 30% of battery and it dies during a training.

Is there anyone who experienced same issues with their watch or should I assume that its battery is damaged and I should claim a warranty for a replacement.