I'm in "Battery Health Charging" mode, charging to 80% and I get about 2 hours out if it on the rare occasions that I actually use it on battery. But I'm not optimizing anything. If you're wanting to play a performance game on battery power, you'd probably knock that down to an hour unless you kick up the battery abuse and charge it to 100%. It's all a tradeoff of hardware vs battery in these slim cases. Just plug it in! You might be able to optimize performance settings more if you're in dire need of operating on battery for long periods. For example, turning off the Screenpad screen, and enabling battery saving in Windows.