Hi cbatist,
I just ran a test with the EBL rechargeable AA lithium batteries you mentioned. The config specs were:
- 64 GB SanDisk Extreme
- 24 hour recording schedule
- 55 sec recording with 5 second sleep
- 48 kHz sampling rate
With this I was able to get 118 hours (4.9 days) of consecutive recordings every minute, and it continued on for another day with increasing gaps (up to several hours) between consecutive recordings. For comparison, when using EBL NiMH 2800 mAh AA rechargeables I would typically get under a day before it completely stopped recording.