@Mallard4468 posted:Thanks to everyone who has responded re 5v vs. 3v. Here's something to add to the fun...
I randomly pulled one of my older MTH locos off the shelf - 20-2657-1 (premier GP40 from a 2006 catalog). It has a rectangular 2-prong charging port and was well after 2004, so I guess that one should assume 3v. However, the exploded diagram in the online manual (https://mthtrains.com/sites/de...loded/20dl17066e.pdf) shows a "9v style" battery; however, 20-2657-1 does not appear in the list of engines on the first page of that document (hooray documentation!). Removing the shell reveals a battery that looks like two AA batteries wrapped together.
Questions:
1) Do all 3v batteries in MTH locos look like two AA batteries wrapped together?
2) Under DCS, the loco functions normally and the battery shows as OK. Is there any need to replace it with a BCR?
No absolute need to replace the battery with a BCR if you have a new battery ......but......for peace of mind in the future on battery issues .......go with the BCR .
