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Hey there...
Series ups the voltage, so that in turn ups the speed. Since the batteries we are using are 1.2v, then two batteries in series is 2.4v. The stamina (mah rating) remains the same.
Parallel keeps the voltage the same (no increase in speed) but it doubles the stamina (mah rating) so two 1.2v 50mah batteries in Parallel makes for 1.2v @ 100mah. You will get a lot more running time this way.
Regards, Shanman
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