Which charging mode should I use for a 12 V AGM battery in cold conditions?

Mode 4 (12 V, 14.7 V / 3.8 A) is suitable for batteries with a capacity of more than 14 Ah in cold state, or for many AGM batteries. Press the mode selection button to select Mode 4, and charging will start automatically after a few seconds. After successful charging, the unit automatically switches to trickle charge mode. (Page 6)