Samsung is improving the Gear S3 battery life with a new update to the software that appears to be getting pushed out to users and having been started recently. While some may feel the battery life on the watch was already decent enough for their own purposes, it's been reported that the previous update which introduced a handful of sizeable new features and changes to the device also had some negative impact on the battery life for a wide range of users. This update going out now seems to be correcting that issue so users can continue to operate their smartwatches the way that they had been used to before the battery life was decreased.
Since this an update that is primarily being sent out with a focus on the battery, naturally the update is fairly small in size in regards to the download file and it also only comes with one other change in addition to the battery improvements, and this is an improvement to the stability of the Bluetooth connection, which some users were apparently having problems with. The software update is reportedly hitting devices for users in South Korea, but also for users in the U.S. as well as Canada.
There's no current mention of the update hitting devices in other regions, so it may be a little while before it shows up in additional countries. If Samsung is pushing this update out in stages then you'll want to keep an eye out for it whether you're in one of the three countries where the update is currently hitting devices or not, as there's always a chance it could show up for your device unannounced just like with the users where the update is being reported. The update shouldn't be too big since it only brings improvements for a couple of things, in which case it shouldn't take too long to download, though Samsung still recommends you download the update via Wi-Fi.