Simon Willison’s Weblog

Battery Statistics. Run “ioreg -w0 -l | grep Capacity” on a MacBook or MacBook Pro to find out the DesignCapacity (original) and MaxCapacity (current) of your laptop’s battery.

Posted 27th July 2008 at 11:05 am

Recent articles

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI - 12th December 2025
GPT-5.2 - 11th December 2025
Useful patterns for building HTML tools - 10th December 2025

battery 2 capacity 1 corstencurdt 1 macbook 3 macbookpro 3 power 3

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe