360modena_cs:
I didn't ask it correctly. What is the maximum current the battery can give? Can I have 4.5A for 1 hour?
You are maybe confusing current with capacity.
You cannot know (without some measurments and tests) what is the maximum current the battery will supply, although sometimes the manufacturer will state this maximum.
A battery with a capacity of 4500mAhr should be able to supply 4500mA for one hour, or 2250mA for two hours etc.