Battery charger for electric bicycle 48 V 3.0 Ah Flat T

What kind of battery can be charged with this electric bike charger?
The 48 V 3.0 Ah Electric Bicycle Charger Closed Maintenance-free also known as "SLA" (Sealed Lead Acid) long-cycle, cyclic batteries can be charged from 18Ah to 30Ah capacity.
If you charge batteries with a capacity of 30 Ah with this charger, the charging time, from a discharged state to a full charge, is approx. 6-7óra.
Charging time depends largely on the age of the batteries, the quality of the installation and the temperature.
When buying a new charger, you should also replace the charger socket on the battery.
This greatly contributes to the proper functioning of the electric bicycle.