Great mouse but...defective model
This mouse is great in every way (ergonomics, lightness, RGB ,software etc....) but after only 6 hours of use the right click started to make a squeaking noise with each click(which is not practical when playing Lol).I had to send the mouse back the next day so I couldn't test the battery properly but I noticed that the use of the leds changes the battery behaviour a lot. It was the first time I bought a mouse of this brand so I preferred to return it and take a Logitech Wireless Gaming Pro X Superlight which will probably be more reliable in time.
In conclusion I think I just had bad luck and it's a good mouse but it's better to stick with a brand I have more experience with.