Scott, here's an idea.....Do you have a set of jumper leads? If so, use the jumper leads to connect the battery post to the remains of the positive terminal. Make sure none of it can touch the bodywork and drive to work. Thewn get a terminal tomorow from an auto parts shop and install it then. Note; once the car is running there is very little current going back to the battery, the alternator is suplying the power to run the car through the remains of the broken battery terminal even if it has come off the battery. It's not good for the alternator to be disconnected from thew battery while the car is running but it will still continue to run even if it does disconnect.