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Current limiting resistor for battery charger?

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http://forum.allaboutcircuits.com – Hello guys, I'm really confused as to what value of a resister to use to control charging current into a charging battery. :confused: Here are some details, Battery is a 6V 4.5AH, the charger (wall adapter) unloaded voltage is 10v but it says 9.5v in the casing, and the loaded output current is 1.5A. There is circuitry meant to stop the battery charging when the voltage reaches 7.25 volts. The whole thing is designed this way, power from the adapter goes through the charge regulator before getting to the battery, with a mosfet switch. The biggest problem is that I need to limit the current (Embedded)