The problem with kit batteries is that they are injection molded, so they have that unrealistic taper called draft angle. Usually, they are hollow and don't even have six sides! These batteries are square, complete, and have detail that isn't possible with the injection molding process. Check the top post detail and side terminals. Four different batteries are included in the set: Universal maintenance-free battery, universal heavy duty battery, Autolite Sta-ful, and a small car battery for OEM compacts and tuners.