Battery life Precision 7680

The system configuration comes into play, as will the settings and what you're running.

If the system has an RTX 2000 or 3500 GPU and that's in use, 2.5-3 hours is entirely reasonable.  

If the system has only Intel graphics (or you disable the nVidia GPU) the runtimes should (or will) be far longer.

The higher-end nVidia GPUs draw 115W at full speed -- and even with reduced GPU speeds, an 83 or 93 WHr battery isn't going to run for hours.  Couple it with a high resolution display and a fast CPU and you'll run up against the limits of a battery inside a system designed for portability.

Hi ejn63,

I dont play with it, just working... No gaming, no video.

Is there a way to disable the nVidia card ?

Just need autonomy. 

Just switch to integrated graphics in nVidia control panel and reboot, but battery is at 84% and annouced an autonomy of 1h20...

Will see.

So, this 7680 is awful... Battery just 2 years old, nVidia card desactivated, shadow mode in W11 25H2 (fresh install), last bios and drivers : In 1 hour battery run from 100 to 0%. Just working, no 4k/8k video, no 3D games, whatever...

A way to return this piece of <profanity removed> and get a true notebook with a decent autonomy ?

You would need to sell it for what you can get, and order a replacement more to your liking.

Dell just says buy a new battery... lol
Oh yes you have a 3 years pro support (this is not a personal computer) but you dont have the extended battery support... 
Poor professional services.

Dell does offer a separate battery service warranty - apparently your purchasing group did not opt for that. Since a battery replacement service costs about $120, it's essentially pre-purchasing a battery -- the cost of a battery is about that much.

https://www.parts-people.com/index.php?action=category&id=142&subid=1665&refine=battery