I ordered 15 units and cases from LabMaker and received it in May 2024, this was their first use. The one other unit I've checked had very similar results. The batteries were ordered from Amazon and supplied by a third party...

Here's the configuration. The batteries were all new right out of the box, same with the SD card. I didn't do anything with the SD card prior to use to format it except put it in the AudioMoth and start the configurations.

Hello, I am using 64 GB SanDisk Extreme cards and 3 Energizer Max Alkaline AA Batteries. Approximately 20 GB of audio was on the cards after the 42 days, so I'm assuming the batteries were the issue. First Recording Summary: Recorded at 19:45:00 28/05/2024 (UTC-4) by AudioMoth 242DE80564D6787B at medium gain while battery was 4.7V and temperature was 29.3C. Last Recording Summary: Recorded at 20:14:01 08/07/2024 (UTC-4) by AudioMoth 242DE80564D6787B at medium gain while battery was 3.3V and temperature was 26.6C.