Battery logger inspired by James Davenport's, written using AWK.

It logs information about the state of your battery pulled from ioreg and stores it into a CSV file. In particular, the current version stores the following data on each invocation:

• Date (UTC)
• Cycle Count
• Design Capacity
• Max Capacity
• Current Capacity
• External Connected

Scheduled Monitoring with crontab

For regular monitoring, you might set it up using a crontab, which you could edit as follows:

$ crontab -e

and enter this:

* * * * * /path/to/your/repo/log-battery.sh

Scheduled Monitoring with launchd

If you prefer launchd (which Apple would prefer that you use), you could make a file like this:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.codiform.OSXBatteryLogger</string>
    <key>ProgramArguments</key>
    <array>
        <string>/path/to/repo/log-battery.sh</string>
    </array>
    <key>StartInterval</key>
    <integer>60</integer>
    <key>WorkingDirectory</key>
    <string>/path/to/repo/osx-battery-logger</string>
</dict>
</plist>

Then save it in ~/Library/LaunchAgents/com.codiform.OSXBatteryLogger.plist and run:

$ launchctl load ~/Library/LaunchAgents
$ launchctl start com.codiform.OSXBatteryLogger

For more about launchd and tools to help you manage it, I recommend Nathan Grigg's introduction and the launch man page.

Header

If you want a header for the CSV File, then either create the file before you run the script or modify it afterwards to include a line like:

Date (UTC), Cycle Count, Design Capacity, Max Capacity, Current Capacity, External Connected