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I want to know myself.  Have made a point to only pay attention to PS3 equipment from MTH for a long time.  If I want to buy any "affordable" MTH subway trains and Amtrak Genesis locos, they will have to be PS1 with the batteries that folks are always talking about and not in a good way.  So I will learn with you about BCR.

Last edited by Amfleet25124

BCR is a brand name for a supercapacitor which replaces the battery in PS1 & PS2.  It is a third-party product.  It is available in two versions: one to replace a 9-volt (actually 8.2-volt batteries in older MTH) and the other to replace the 3 volt (actually 2.4-volt) in later PS2 locos.  The 9-volt model has supercaps in series with Zener diodes to keep them even;  it is patented.

It is not a battery, but has the capability of storing enough electrical power to keep the electronics (NOT the motor) operating as necessary for a proper shutdown or to precluse reversing upon a very momentary current break.

Further to something Uberstationmeister said and what's stated on J and W's website, you charge your engine first for a minute EACH time you're going to run a BCR equipped engine; but unlike a typical MTH battery the BCR never needs to be replaced.  Hence, there's no chance of destroying a PS2 (and/or a PS1) circuit board from a dead battery.

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