I have recently purchased a MTH Proto 2 diesel mint but made about 10 years ago. I want to replace the battery with a BCR. The seller assured me that he took out the battery and replaced it with a new fully charged battery, everything worked fine. He then put the old battery back in. This battery I removed says 8 volts. I have heard of new 3 volt systems. I am just not sure which type of BCR to put in this loco. Any help would be appreciated.
Paul Edgar
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If you have the flat battery with the two terminals on the top, you need the original BCR which replaces an 8.4V rechargeable battery. You can also identify which system you have by checking the charging jack, round is the 5V system, rectangular is the 3V system.
Gun
I have noticed on ebay that Proto 2 BCR's look like 2 tripleA batteries wrapped in plastic. Nothing like the Proto 1 BCR's. Do I want one of these or one that looks just like a Proto 1 BCR?
Paul
Proto-2 started out using the same 8.4v rechargeable battery as Proto-1. Along the way, MTH changed the internal design to use a 3v battery pack. So basically, you select a BCR by looking at what's in your unit and buy the BCR that matches. If you took out an 8.4 volt battery, install an 8.4 volt BCR.
See my previous post Paul, both types were used in PS/2, depending on the vintage.
Go to J and W Electronics Check out the BCR's there. To be certain, email the model # of your MTH Proto 2 diesel to Wayne Renga. He will know which BCR to use.
Come to think of it, the instruction manual for that diesel should identify the Proto-2 system.
Like I said, you can check the charging port style to determine what's in there. Also, once you open it up and find the battery, the type should be obvious. 
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