First of all, I love using my watch and it is extremely helpful in my everyday life. From checking simple notifications, to keeping track of time, and replying back to text messages while I'm driving, this watch is amazing.I only have one issue with the watch. When i first got it and set the watch up, I noticed that it was using an extensive amount of battery power, when I wasn't physically using the apps on the watch. I did some checking in the settings and watch preferences using the galaxy wearable app on my A42, and I discovered that the watch was automatically creating workout routines, taking my blood and oxygen levels every 5 minutes, and a bunch of extra health and fitness widgets and apps that I didn't need.Once I turned all of the extra monitors off, the battery life increased to 1 day and 23 hours.I've read a lot of the reviews fro the used version of this watch, and reviews from the SAMSUNG website about this watch having poor battery life. I think that people just don't know how to configure their devices properly.I would buy this used/renewed version of this watch again if my watch broke, and I would refer this to anyone looking for a watch that has a SAMSUNG phone.This watch has been a revelation. I didn't expect much and thought there was a 50% chance I'd be returning it. Wow, was I wrong. It's so fast, helps me stay off my phone and is super fashionable! I love the way it looks, the fitness features, media controls, etc. The battery lasts ~ two days with always-on display turned on but all the data connections other than bluetooth turned off.It also looked absolutely brand new, even as an Amazon renewed product. Very impressed, one of the best purchases I've ever made.Great watch, but can not get contacts to work, the battery life is only good for a little over a day, and when charging it gets extremely hot, stops charging, and restarts charging once cooled down. Otherwise, this is an amazing watch for tracking health, and notifications.I absolutely love this watch. I can read and respond to all messages from my wrist, and track all my steps, time, and calendar reminders without having to pick up my phone. My only con-is the battery life doesn't last no more than 2 days without a full charge.So at first I loathed the watch and thought I received a dud. The battery life was nearly non-existent. I would have to charge the watch maybe twice a day. It didn't last a shift at work. I was peeved. I was about to send it back but I ended up turning off the data, and voilá. Just like that, I have a battery life that lasts me 24 hours or more, on one charge, no matter the watch face I use. I am so happy with this buy. Bright, vivid display, the bezel isn't a bother and is quite responsive. I was aggravated when the watch 5 came out a couple weeks after purchasing this but I'm super satisfied with this.I love the look and feel of this watch. I had a Fitbit versa 3 before this and loved it, but it died on me and I decided to go for the smartwatch s4. It does everything I want and more. The band is comfortable and this is water resistant. You can go in the water with it and it has an option to block water from the watch. Really, the only think I do not like about this watch is the charger and battery life. I literally just got the watch yesterday and had it charging over night and it only charged half way. I finally got it to 100% and only 5 hours later and barely using the watch, the battery is at 35 %. How am I supposed to get accurate steps, sleep score etc. if I have to continually charge the watch.Update: I ended up going back to the fitbit Versa 3. I just couldn't deal with the low battery life of the Samsung watch. Too bad because I really did like the watch other than thatEl reloj es amigable, fácil de entender y de configurar. Lo único que no tiene positivo es la batería debido a que hay que cargarlos todos los días, no tiene mucha autonomía en ese sentido. El resto, muy buena experiencia.I love the watch but charger didn't work and I called. Still no charger.La versión LTE no funciona que esa es la razón principal para usarlo, ya que mis planes era poder contestar sin tener que llevar el teléfono , el reloj es una joyita excelente funcionalidad pero sin duda desearía más batería, creo que buscaré la siguiente opción.Lo tuvimos que regresar. Leer bien las indicaciones de este proveedor. No lo recomiendo ya que el reloj no dura su pila y por el precio es mejor comprarlo directamente en tienda.El producto llegó muy mal empaquetado, las correas no son samsung, el cargador se lo más chafa, todo envuelto en bolsas de oPlástico.Me encantó!! Buena duración de la batería