Would it be possible to use a portable power unit to plug into the usb to maintain a charge whilst changing the batteries so as not to loose the configuration?
Any portable mobile phone charger should work. You can try it out with a normal USB cable to a computer. You should be able to go from running just on batteries, to running on USB and batteries, to running on just USB without the AudioMoth stopping or losing its configuration.
Any portable mobile phone charger should work. You can try it out with a normal USB cable to a computer. You should be able to go from running just on batteries, to running on USB and batteries, to running on just USB without the AudioMoth stopping or losing its configuration.