OpenLog Artemis Battery power & reset

Before I found this thread I spent many hours trying to get the Artemus to log reliably to SD when powered by battery - without success. I am keen to use the Artemis Open Log for a large scale citizen science project in the sea - with the idea that the Artemis will connect via Bluetooth to upload logged data when it is hauled to the surface. In addition to the battery/ SD challenge is the firmware being upgraded to include the BLE? Grateful for any advice.