I have a 3rd-party bit insert for my Leatherman that can check voltage on batteries, so I’m set for this problem (volty by pcpoodle)

Something on-battery would be cool, but with that Duracell PowerCheck implementation never seemed right to me, it seemed to show the battery having more and more power the harder and harder I pushed on the spots. 🤷

Julian date format, Dec 14th (349th day of the year)

The LJ prefix is some manufacturer code, not relevant to exp date