Last weekend, it came to light that Samsung has included the Gear S3 battery issue fix in the Tizen 3.0 update itself. The revised update was rolling out slowly, beginning with the US, and now it has reached Europe. The update carries a firmware version of R760XXU2CQL1 and weighs in at around 21MB. As is usually the case with OTA roll outs, it might take time for the update to hit your device, so be patient. Via
Source: https://www.gsmarena.com/revised_gear_s3_tizen_30_update_starts_hitting_units_in_europe-news-28874.php