The Drift has bluetooth and heating, the ECO model does not have bluetooth or heating, the Victron MPPT controller is set to stop charging below 2 degree, we have not seen any zero temperature since November, the lowest we are seeing at night 3 degrees C. When I recorded the below 8v temperature was 6 degrees C, at the moment the battery charging recording 12.01 v 3 degrees bulk. Not to impressed with Fogstar their advice is to down load the APP and send a screen shot (the ECO does not have bluetooth (the APP obviously is showing nothing) or to see the knowledge hub, I can find nothing which relates to this issue.
Is the battery balanced as it shouldn’t be going below 10v imo. Motorhomefun.co.uk forum has a lot of chat on the drift batteries, maybe ask a question or see if theres an answer there, as I’m not that familar with them.