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It’s interesting, over the years MTH offered both NiMH and NiCd batteries in their PS2 locomotives.  From my research, the charging curves for these are somewhat different, and while charging a NiMH battery in circuitry designed for NiCd will kind of work, it can damage it over time by repeatedly overheating the battery.  It’s the overheating which can cause these to leak electrolyte, I think.  

I’ve often wondered if this was a design consideration in the PS2 charging circuit.  

I can’t read it in the picture.  Is this a NiCd or NiMH pack I wonder.

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