If you need to use force to remove the wiper blades you are doing something wrong. The blades should be very simple to remove and require little or no force, especially not a battery terminal puller. Purchase a new blade first and you can better figure out how and where the old one comes off the arm. Sometimes the right and left blades are a different size, measure each blade; go to an autoparts store and tell them what you want. They might even give you some instruction. It doesn't take more than a few seconds to remove and install a new one.