My Macbook battery gave up the ghost this weekend so I ordered a new one. On replacing it I noticed all the scratches caused by four years of constant use on a wide variety of surfaces. I thought it might be interesting to record them for posterity and investigate them further so I scanned the battery and boosted the contrast. Here’s the original scan and the processed image.

What’s particularly interesting is the different qualities of scratch, from fine shallow lines to rough staccato gouges. Each place left its own mark, a journal of the places I’ve been.