I had a BCR take several minutes of running before an address change would stick. I did not do any tests during that period. I can only conclude that the particular engine's charging circuit took longer to charge the BCR. That engine has worked fine ever since. That was after the following engine issue...
I had another instance (first one) where a used engine had dead batteries. The 3 volt board still acted like it had a dead battery, when a BCR was installed. I swapped the BCR with a set of the stock special AA batteries from another G scale MTH engine. Both engines ran fine ever since with that swap left in place.
All other instances of installing the 3 volt BCRs has been fine. I try to check them more after a swap and also monitor their life.
So I like G's post above about charging a dead BCR. Maybe these two are my oldest (bought used) G scale engines have weaker charging circuits? Also another thought, maybe they got that way from running with dead batteries?
