The rectangular battery is for the 5V system. I have a large number of engines and they all have a battery. No BCR on my layout. I will buy an engine with a 5V system if the price leaves enough room to update it to PS2 3V or PS32. Some of those engines were great (minus the board) and were powered by the giant Pittman motor. They make great conversions. I have many former 5V engines that were converted to PS2 3V or PS32.
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