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Sorry for slow reply. I’ve been hunting some of these hard-to-reproduce bugs and have made some progress. I did more testing with 32GB SD cards (though mine were SanDisk) and also saw my logs being split sometimes unnecessarily. This happens when the firmware encounters an error writing to the SD card. I made the firmware smarter so that when it encounters a write error, it will resume where it left off instead of splitting in to a new log file (among other small improvements).
If you aren’t already in the beta program, I recommend joining it and updating meter firmware.
Regarding NiMH batteries: They work fine, but won’t last as long as AAs. The meter will refuse to start up on less than 2.4V. You should definitely be seeing battery life longer than 3 weeks, please let me know if you encounter the same issue with new batteries.