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I want to do nothing on my MacBook except watch pre-downloaded MP4 videos.
How can I make the battery last as long as possible in this situation?
I will of course already:
- screen minimum brightness
- quit every other app except the MP4 player
- play in small window not full-screen
What other secret options or configuration can I take advantage of?
- Engage low power mode
- Putting the video full screen saves the most energy for me for almost all video sources I consume or test
- Disconnect all accessories (or power down radios like WiFi and Bluetooth to ensure no processes start that could be avoided even though the radio transmitter / receiver / amplifier power savings may be marginal )
- Re-encode video to be smaller resolution while you still have power source. Less decoding means less CPU time, reducing energy usage
- Re-encode video to have slower framerate (some HD videos are 60 FPS but 24 FPS might be “good enough”) while you still have power source
- Re-encode video to use “easier” decoding while you still have power source. For example, H264 over H265 (storage space tradeoff for CPU time)
- Enter fullscreen, and disable scaling/fit-to-screen (play at original size)
- Buy external battery pack and use it to charge MacBook
- Replace internal battery with a new one (especially if battery capacity is failing)
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