[chiffre]

> built-in Nvidia GPU

  GPUs could consume a lot of power. 

Source: I used a Windows 10 laptop (not Thinkpad) with Nvidia GPU and it usually lasted less than two hours on battery. I work on another laptop, Thinkpad without Nvidia or AMD GPU, it lasts 6-8 hours on battery.

[Causality1]

For a given CPU and battery capacity, Nvidia Optimus and AMD XConnect mean there's effectively no difference in battery life between a laptop with and without a dGPU, assuming you keep the dGPU disabled while you're using it. There are of course gaming and workstation laptops that run the dGPU at all times but you get what you expect with those.

[chiffre]

Agree with both points, but tachyonbeam wrote:

  > built-in Nvidia GPU (which 
  > I use for machine learning)

And I used aforementioned (gaming) laptop with GPU mostly for Deep Learning