OK, thanks.. I only remember installing one 8v battery and that was in an old Ford tractor when I was a youngster.. Always had trouble with the regulator after that, don't if it was the batteries fault though.. I had to replace the A's battery yesterday[ it was only 12 years old] and the young fella tried to sell me an 8v.. I don't think they are very good sellers and he needed to get rid of them.. When I left he still the same number of them but the shelf had one less 6v.