4,5Ah-5Ah is smaller lead acid and acording to many datasheets charging current should not be higher. I think 1-2A is to high for these batteries.
7,2Ah have max charging current of 0,7A.
Also voltage of 14,2-14,4V is used in cycled charging. Cycle charge is used when battery is discharged below 50-40%, when battery is full this voltage should be maximum at float voltage.
If charger cant manage with output voltage, better set float voltage between 13,5V and 13,8V depending from ambient temperature.
Check manufacturer datasheet for battery and use this document as reference.