I understand that they use a gel technology, thus the mountability. Also super resilient to vibration and heat/cold. The yellows are the real deal and for high load capacity stereo, and accessory needs. The red tops can work in this as well but obviously are not deep cycle. There are also to different red tops that I noticed as well.2 types. I got the higher. Its all cold cranking amps!! Go Big-
P.S. I got some trick post mounts made by tsunami, they are titanium, look like bullets, and are slick. Gold connector hardware. They are found in good stereo shop. Look slick with the Optima for sure-