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The MT battery pack is 2.4VDC @ 120mA. The battery you used is 3.4@600mA. 600mA is not a problem at the voltage of the original battery or 2.4VDC. When you add that other volt to the current, you're pushing too much in at once and frying the circuitry. You are going to have to restrict either the current or the voltage in order to use that battery. And, if longer runtimes is your goal, you'll need a voltage regulator between the battery and the PCB that will restrict voltage to 2-2.4VDC.
As to gearing, check out Chili's ZZ site. He has all the info you need there. Sorry, can't provide a link right now, but you can find it all over the forum.
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If it ain't broke, tear it apart and see what makes it tick!
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