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I use a Magic Mouse and Magic Keyboard, which go for weeks or months at a time without needing a charge, and then they notify my when they're right on the verge of shutting down. After a lot of exploring here and stackoverflow (it seems the ioreg parameters have evolved since most posts were written), I see there is a command which gives me visibility of the current battery level:

ioreg -r -l -k "BatteryPercent"

... which produces output which includes:

+-o AppleDeviceManagementHIDEventService  <class AppleDeviceManagementHIDEventService, id 0x100000635, registered, matched, active,$
{
  "LowBatteryNotificationPercentage" = 2
  "BatteryPercent" = 11
  "CriticallyLowBatteryNotificationPercentage" = 1
}

If I could increase those notification percentages to say 5% and 10%, then they'd mean "hey, don't forget to put me on charge when you're done for the day", whereas right now they mean "uh, oh, you probably won't make it to lunchtime!".

I've explored the output of defaults export /Library/Preferences/com.apple.Bluetooth and indeed all of defaults, thanks to this AskDifferent answer, but can find nothing that looks like a way of setting the level at which the notifications are triggered.

I'd prefer not to need to install and have running a 3rd party tool to simply raise a watermark.

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