I charge my s7 fully up before bed, sleep with it on and use it all day, after 23h it goes back on the charger with around 30% left. No workouts or anything else like active use of cellular or any apps. So if you will use the watch more actively it might not be enough but for me it is great!

Ultra

Charge it while on the throne in the am and then while in the shower after working out.

I will be honest here and I might get downvoted to oblivion since this Apple Watch group. I used a Huawei band that is like $20 only then after that, a Huawei smart watch. Very straightforward, just wear and it will automatically track your sleep, Awake, Light, REM, Deep, etc. No complications! The battery lasts for more than 5 days. I recently upgraded to AW thinking that it could be better but to be honest, it’s just basically the same. The Huawei has blood oxygen monitor too but my SE which is a bit more expensive than the Huawei doesn’t. Going back to sleep monitoring, I found the Apple sleep monitoring too complicated, maybe because I came from something that doesn’t require something like setting bedtime, sleep focus, and I even ended up getting a 3rd party app so I can track my naps. If you need sleep monitoring, maybe you need to look somewhere else. I am not saying Huawei because if you are in the US, then you might not have it but there are better sleep tracking watch out there for sure. I know some folks here are recommending Ultra but I don’t see the point of spending almost a thousand dollars just to get extra days of battery life so you can track your sleep.

Just charge at the evening works with my S6 with 80%

Bought an S9 on Black Friday after some time wearing Casios now I’m back. I also bought it for sleep tracking and regular use - I rarely do workouts, so I know that takes up a lot of battery life.

So far, it’s lasted 2 days on one charge. I normally don’t let it die completely, since I like to have enough juice to wear it at night. It’s got raise to wake on and I’ve tried to turn off somethings that will drain the battery - if anyone has any tips on what drains, please help me here, sometimes I really don’t know what to turn off, lol.

And it charges quite quick I think, about less than an hour it’s good to go. Don’t be fooled by the ‘faster charge’ on the 8 and 9 models. It’s literally 15’ faster on a charge than the regular one, it’s really a joke, if you ask me. A ‘faster charge’ would be like 30 minutes vs an hour imo, but it is what it is.

Overall it’s an all day watch really. Apple Pay is absolutely perfect and blazing fast, watch faces are great, all apps I need work perfectly well, the larger screen is great and the S9 is a good watch if you wanna track your sleep, since it’s not uncomfortable to wear at night.

I have a series 8 and I charge it in the evenings when I put my kid to bed. Takes an hour or less.

If you want to track your sleep I recommend Oura ring. I also have both watch & ring. Apple watch doesn’t come close to the insight/accuracy Oura ring app gives