Not for me, I have already replaced it with a S3 LTE and I’m very happy. This new one is faster and the battery is much more powerful.
I have to say anyway that yesterday I ended with 16% only! I went to run for 1:25 with a chest strap and later I walked 17km more so I was all the day moving. Usually I end the day with 50-60% of the battery still remaining on the watch.
I changed it also because I swim three days a week and run another three so gps and swimming abilities were important for me. If in your case the S0 is enough, I’ll worth to replace the battery. It’s a very personal and subjective decision
BR!
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Not my case! Mine end with no battery around 8-9pm as I said.
With one hour workout at lunch time, it dies around 4pm.
I didn’t measure the battery using any app, but I can tell you that my battery is not in good condition

my purchase date was same, June 2015, launching date here in Spain.