Your link didn't work for me so I did a search on their web site and found the following:
1500W DC Motor 40A Speed Control Switch PWM Stepless Adjustable PLC GovernorI foresee a couple of issues.
The controller probably needs a smooth DC input. A battery charger most likely is an unfiltered DC output.
The specs don't mention an output voltage. The output is PWM (Pulse Width Modulated), which means it's a square wave output and most likely with peaks equal to the input voltage. If this is the case, your battery would charge up to the peak voltage which would be the same as the output voltage of the charger.
