@gunrunnerjohn posted:I'd use a BCR or a BCR clone instead of a battery. If it started up and actually ran (it'll do that under command control without a battery), the board may well be fine.
It looks like either that battery had a flaw or the charging circuit went nuts! The good news is, I still have some of the power supply boards for the 3V PS/2 board sets if it's the charging circuit.
I go along with John......skip the battery holder and just install the BCR or the BCR clone.