This charger is suitable for 48V LiFePo4 batteries.
The charger has an LED indicator.
LED red = charging
LED green = fully charged
The charger has a charging current of 2A. Therefore, the charging of e.g. totally emptied 20Ah Batteries:
20Ah : 2A = 10h
Therefore the battery is fully charged after max. 10h and the charger can be removed.
The charging time is therefore shortened according to the charge output status of the battery.