We have a 2002 Classic with 4 T105 6V batteries in series for 12V
use. They are 8yrs old and have always been charged with its 3 stage charger. Constantly plugged in, periodically added water and have until recently held +12.7V unplugged... now 12.45V after a few hours unplugged. Charger gives 14.4/13.6/13.2 when plugged in.
Suspecting a bad cell somewhere but hoped to get some good thoughts before separating, removing and testing. Popular wisdom says if one is found all get replaced.
Any help or advice before launching into the Rx would be much appreciated.