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What current rating is needed on a Nimh 9 volt battery used in MTH PS-1 engines?

I bought 3 NOS Railking Hudsons at York that are PS-1.  My understanding is that the battery should be replaced and charged before using the engines.  I found some 250mah and some 600mah 9 volt batteries on line.  Would either of these be acceptable in the PS-1 engines?

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