Current intel ones supposedly have 10-12 hours of battery, and many times i find that they don't even get to 3 hours, leave open a browser tab that uses webgl

Current intel ones supposedly have 10-12 hours of battery, and many times i find that they don't even get to 3 hours, leave open a browser tab that uses webgl or an app that uses the discrete graphic card, and you are doomed. At least on the 16" inch, I'm very disappointed with the battery life.