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not only that
Not just the amount of electricty (Volts) but also the current draw (Amps). A MOSFET transistor may be able to handle 5V at 200mA but if you run 2.5V through it and the motor pulls a current of 400mA, it's going to sizzle like a slice of bacon. Also note this, mA is the current draw, while mAh is the stored capacity of a battery (the length of time it will last before drained). I don't know if the statement about the 4.2 is true or false, I'm just stating that it's plausible.
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