Unfortunately,  sales@openacousticdevices.info does not answer my email. I have found: https://groupgets.com/products/set-of-four-splashproof-acoustic-vents-for-the-audiomoth-usb-microphone-case Can those be used on Audiomoth Official IPX7 Waterproof Cases? I suspect I might need to change all vents and not just the broken ones as these vents are GAW112 instead of GAW334.

GAW334 vents are not currently available through groupgets (price was 4 units for 9.95 eur) and are available through LabMaker but the price is 15 units at 99 US$. Is there any other way to get them? 15 are way too may in my case. Also, according to this information: https://www.gore.com/sites/default/files/2017-10/GORE-Acoustic-Vents-Immersion-Application.pdf it would seem that there are newer, better versions, is this correct?

OK, then I take as lesson learned that we have to check batteries with a tester prior configuration and not rely on the "BAT 4.6V" reported by the config app, in particular for lithium batteries. Thanks a lot.

Thanks for your many advises and expert opinion. I think I could have mistaken the batteries (or some of them) and put used ones instead of new ones. But my concern is: considering the configuration app was reporting "BAT 4.6V" (which I understand is acceptable), how could I have detected that the batteries were actually not good before the deployment?

Right: 20220828_143000.WAV 3 minutes 32 seconds Recorded at 14:30:00 28/08/2022 (UTC) by AudioMoth 24410E085728D5E5 at medium gain while battery was 4.2V and temperature was 22.6C. Recording stopped due to low voltage. 20220829_040000.WAV 2 minutes 14 seconds Recorded at 04:00:00 29/08/2022 (UTC) by AudioMoth 24410E085728D5E5 at medium gain while battery was 4.3V and temperature was 11.7C. Recording stopped due to low voltage. 20220829_173000.WAV 28 seconds Recorded at 17:30:00 29/08/2022 (UTC) by AudioMoth 24410E085728D5E5 at medium gain while battery was 3.8V and temperature was 18.0C. Recording stopped due to low voltage. While a correct one: 20220828_100000.WAV 5 minutes 0 seconds Recorded at 10:00:00 28/08/2022 (UTC) by AudioMoth 24410E085728D5E5 at medium gain while battery was 4.6V and temperature was 27.1C. I'm using https://www.energizer.com/batteries/energizer-ultimate-lithium-batteries. According to the config app, consumption was estimated at 44 mAh/d and indicated "BAT 4.6V" I assumed: * BAT Energizer Ultimate Lithium 3000 mAh, thus 3000/46 = 65d IS this wrong? Where you say: If these are alkaline batteries then 3.8 / 3 =. 1.26V per cell is quite low. Under additional load when writing to the SD card and at lower temperatures, the internal voltage drop will likely push it below the threshold. How much should it be? I often see BAT > 4.9V Is 4.9 the threshold you refer to?

While my ubuntu-based linux reports Audio info for the correct wav files, eg: The entire Audio tab is missing for the 0 bytes files and Audiomoth and Raven do not recognize these files as audio files. I link here one example of each: Correct file: https://www.dropbox.com/s/th3q5nxtbjv4jcx/20220828_100000.WAV?dl=0 0bytes file: https://www.dropbox.com/s/ameoc0j4k74lhxr/20220828_150000.WAV?dl=0 The Configuration App reports Batteries at 3.8V after the unit was collected: I will reformat the SD, run for few days indoors and report back.

What do you mean by 11x5 mm ? The vents are circular.

See https://wildlabs.net/discussion/replacement-acoustic-membranes-audiomoth-case

Thanks a lot for your clear explanation. Hope you can make the config app start with the configuration kept in the unit in forthcoming versions. It is probably much more difficult than it could seem at the eyes of an ignorant. Thanks a lot for all the great work you do.

The saved config can be saved manually in the app ‘File’ menu and then loaded onto the app I know, thanks, but this is not the point. however, it can’t read the configurations off of a device. I think this is very confusing. If the unit has a file with the saved configuration, the app should start with it. Perhaps you could add this to your list of improvements. Anyway, the most important point for which I need confirmation: does the saved file in the SD guarantee that the specified configuration would be used after, i.e., replacing batteries and deleting the rest of files? Or do we need to run the configuration app every time we switch from CUSTOM to USB/OFF ?

In that case, if I 1. Quit the app. 2. Disconnect from USB. 3. switch to CUSTOM, back to USB/OFF 4. Connect to usb 5. start the config app would the saved conf be displayed by the app? (cannot check myself now, I have all units deployed)

Any news regarding the updated sd guide? Please state the date of publication on it.

Thanks. I doubt I tested in DEFAULT mode at all, although the files could be leftovers as I did not reformat again before deployment. But my main concern is: can we assume this is a SD problem? Can we discard another issue with the unit itself? I understand we have to test, but I would appreciate knowing your opinion as the test takes few days. If you think this is probably a SD problem, we can change and deploy again, going to check the SD card after few days (I understand we can just check the SD while the unit is not recording and then put it back again without need of reprogramming the unit).

Thanks for the info, could you please state the actual manufacturer(s) and model(s) with which you have experience? It would be very useful.

Should I understand there is no warranty? Should I try to repair as mentioned in https://www.openacousticdevices.info/support/device-support/simple-audiomoth-switch-repair ? (although nothing looks broken in my unit)

Thanks. I stay tuned for your results.

@Alex Rogers Correct, always the red light on and green one flashing. I bought this one within GroupGet for AudioMoth v1.1.0 (Round 7)

@Alex Rogers Correct, always the red light on and green one flashing. I bought this one within GroupGet for AudioMoth v1.1.0 (Round 7)

Then no fix? Is there a warranty?

No, same feeling.