https://www.practicalreason.net/tags/camera/Recent content in Camera on Reverting to TypeHugo -- gohugo.ioen© 2026 Dermot O'HalloranSun, 11 Feb 2018 20:20:55 +0000https://www.practicalreason.net/posts/canon-cannot-communicate-with-battery/Sun, 11 Feb 2018 20:20:55 +0000https://www.practicalreason.net/posts/canon-cannot-communicate-with-battery/My secondhand Canon 7D developed a “Cannot Communicate with Battery” warning. I didn’t think much of it at the time as the camera still worked perfectly. The only minor annoyance was that the battery power indicator no longer appeared on the top LCD window or in the battery details screen in the main options panel. The problem became far greater when a week later I grabbed my camera to head to a local event only to realise that the previously fully charged battery was now empty despite little usage.