is a small Python script which reads battery information from system_profiler and logs values to a SQLite database located in ~/.batterylog.sqlite3. This data can be used to track battery health over time.

batterylog was written under Mac OS X 10.5.7 and Python 2.5.1. The code is made available under the MIT License.


The current release, 0.2, may be downloaded here (text/plain).


The script may be run directly using python path/to/ You may also put it in your $PATH:

mv /usr/local/bin/batterylog
chmod 755 /usr/local/bin/batterylog

Automatic Execution via Cron

batterylog may be run hourly via cron with a crontab entry similar to the following:

59 * * * * python ~/path/to/
*/10 * * * * @AppleNotOnBattery python ~/path/to/

This combination runs batterylog one minute before the hour (I chose this number for hourly results that would potentially get stats right before midnight) as well as every 10 minutes when running on A/C power.


I haven't graphed any of my data yet, as the script was only written two days ago. I'll update this space once I start graphing. In the mean time, here's a line that will export the database to CSV:

sqlite3 -separator , ~/.batterylog.sqlite3 'SELECT * FROM log'