Is there any update on the sound triggering. The ultrasound background can be very quiet except for a few intermittent bat calls. Is it possible to "monitor" and record only when the sound level in a tunable frequency or frequency range exceeds a specific intensity value. A prebuffer could be useful too in this case.
I have seen two posts on this forum regarding rechargeable batteries. I am currently thinking about investing in purchasing 1.2V Envee 2800mAH rechargeable batteries, as I will be creating much lesser electronic waste compared to purchasing regular alkaline batteries. Apart from operating at the lowest threshold for the Audiomoth's, has anyone used rechargeable batteries for a while now? How does it affect the performance? Did you have to replace them every few days? Any issues with writing data to the SD Card?