Hi, it does the same thing on another A board. And other b boards work fine on both A boards. Unfortunately I don't have EPROM reader or burner. Te voltage on the battery was OK when I checked it a week or ago but I'll check again. I seem to remember it reading the voltage slower on this battery. What I mean by that is it would read maybe a 1v, then take Another few seconds to reach 3.6v. Whereas batteries on my other CPS2 boards would read 3.6v in a split second.