this should be an easy one for some of you. i have a controller thats rated for 36 - 48 volts and a 36 volt fleet speed motor. my cart is originally a 36v. can i add two more batteries to make it a 48v and still use the 36v fleet motor? will i run into any problems with the motor over amping or damaging my controller? is the speed or power increase worth the extra cost? thanks for any input