I retrieved my AM (model 1.2.0, firmware version 1.4.0) after it had been in the field for 2 weeks. It was using rechargeable batteries and a 64 GB SanDisk Extreme SD card.The AM was configured to run for 2 hours 45 mins each day which wouldn't have been long enough to fill the card. The batteries had run out (not entirely surprising) but the SD card was dead - it isn't recognised by any computer, e.g. not listed with diskutil on a Mac.
The 'Use NiMH/LiPO voltage range ...' and 'Enable low-voltage cut-off' settings were both checked.
The SD card had been used previously for about a week without any issues.
Is this likely due to the batteries having run out? I have subsequently run the AM overnight with charged batteries and a new card with no problems.
Thanks Alex, I suppose I was just unlucky!
Hi Nick, It seems like that's a possibility. The AudioMoth will stop recording when the battery gets too low and we've done lots of tests running AudioMoth devices down with rechargeable batteries without incurring any damage to the SD card. Normally, the recordings are cut short and then they are no longer made as the battery reaches the end of its capacity and the voltage starts to rapidly drop. Alex