Checks battery level for Magic Mouse, Magic Trackpad and Magic Keyboard on macOS.

batcheck.sh

#!/bin/bash
# Script that checks the battery level of connected Magic Keyboard, Magic Trackpad, and Magic Mouse and displays a notification if it is below a threshold (default 15%).
# Optionally set threshold as a parameter. ex: ./check_kb_battery.sh 10

COMPARE=${1:-15}

check_battery_level() {
    device_name=$1
    battery_level=$2

    if [ -z "$battery_level" ]; then
        echo "No $device_name Found."
    else
        echo -e "\n$device_name Battery Level: $battery_level%"
        if [ "$battery_level" -lt "$COMPARE" ]; then
            osascript -e "display notification \"Battery Level at $battery_level%\" with title \"Battery Low\" subtitle \"$device_name\""
            echo -e "⚠️ $device_name battery level is low!! Currently at $battery_level%\n\n"
        else
            echo -e "✅ $device_name is good."
        fi
    fi
}

# Check Magic Keyboard
KBNAME=$(ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i 'Magic Keyboard' | cut -d = -f2 | cut -d \" -f2)
KBNAME=${KBNAME:-Magic Keyboard}
KBBATTERY=$(ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i "$KBNAME" -A 20 | grep BatteryPercent | cut -d = -f2 | cut -d ' ' -f2)
check_battery_level "$KBNAME" "$KBBATTERY"

# Check Magic Trackpad
TPNAME=$(ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i 'Magic Trackpad' | cut -d = -f2 | cut -d \" -f2)
TPNAME=${TPNAME:-Magic Trackpad}
TPBATTERY=$(ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i "$TPNAME" -A 20 | grep BatteryPercent | cut -d = -f2 | cut -d ' ' -f2)
check_battery_level "$TPNAME" "$TPBATTERY"

# Check Magic Mouse
MNAME=$(ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i 'Magic Mouse' | cut -d = -f2 | cut -d \" -f2)
MNAME=${MNAME:-Magic Mouse}
MBATTERY=$(ioreg -c AppleDeviceManagementHIDEventService -r -l | grep -i "$MNAME" -A 20 | grep BatteryPercent | cut -d = -f2 | cut -d ' ' -f2)
check_battery_level "$MNAME" "$MBATTERY"