Battery Life Test Methodology

How we test battery life:

• The screen is set to 180 nits of brightness
• If the device has an iGPU-only mode, this is activated
• If not, the test will be executed with the standard NVIDIA Optimus / Advanced Optimus / Auto mode settings
• All battery-saving features that don't decrease visual quality are applied.
• This includes:
  • Best Power Efficiency mode and Energy Saver mode in the Windows Power & Battery Menu
  • Variable Refresh Rate (if present, that's a display/laptop dependent extra)
  • Panel Self Refresh (if present, that's a display/laptop dependent extra)
  • The most energy-efficient mode is selected by the manufacturer's own software that controls the notebook's power

Settings Used

To maximize the battery life of this gaming beast, you could use the following settings:

• Select the Battery Saver in the Lenovo Vantage app
• Apply Best power efficiency + Energy Saver Mode in the Windows Battery menu
• Variable Refresh Rate is enabled
• Screen is set to 180 nits

The same 50 Wh battery lasts almost an hour less in this laptop compared to the 8840HS version. It looks like the 13420H is thirstier or that Lenovo's fine-tune isn't optimal.