This post has soo many assumptions running in it. I can tell you that the dry-cell and agm batteries are basically the same inside. This is from actually working in the plant that manuf. most of the dry cell batteries for a variety of companies. Ford,gm,chrysler,walmart,sams club, advanced auto, interstate.. etc. I been thinking about runnign this interstate megatron up front and this yellowtop optima in the back myself. The same type of battery I always chalked up to urban myth. I am not sure about wet cell vs dry cell. The optima is a dry cell agm battery and the interstate is also a dry cell battery. I always thought what would happen is they would drop down to the lowest resting voltage of the battery whatever that is.. so if one is 12.9 and the other 12.5 the one would feed on the other till the two were the same voltage. Could be totally wrong thou.