This charger is suitable for 48V lead batteries.
The charger has an LED indicator.
LED red = charging
LED green = fully charged
The charger has a charging current of 1,5A. Therefore, the charging of e.g. totally emptied 12Ah Batteries:
12Ah : 1,5A = 8h
Therefore the battery is fully charged after max. 6h and the charger can be removed.
The charging time is therefore shortened according to the charge output status of the battery.