Have a look at SleepOnLowBattery (“SOLB”): https://www.tonymacx86.com/threads/release-sleeponlowbattery-solb.264785/ or https://www.insanelymac.com/forum/topic/336414-release-sleeponlowbattery-%E2%80%9Csolb%E2%80%9D/ It's open source, works in current macOS, and you can adapt anything to your liking 👍
Have a look at SleepOnLowBattery (“SOLB”):
https://www.tonymacx86.com/threads/release-sleeponlowbattery-solb.264785/
or
https://www.insanelymac.com/forum/topic/336414-release-sleeponlowbattery-%E2%80%9Csolb%E2%80%9D/
It's open source, works in current macOS, and you can adapt anything to your liking 👍