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Moving the wires will allow you to charge a 2 battery car. Thats 3 volts to change a 2.4 volt battery setup. I don't know why you're using 4.5 volts to change your 2.4, you're going to ruin your batteries.
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You allways charge batteries with a higher voltage in the other end. Otherwise there is no charge. To simplify: The voltage is the "power" that decide what way the current will go. If you have the same voltage in both ends nothing happens. Maybe it works with brand new 1.5 V batteries, but the voltage in ordinary batteries is rapidly decreasing when the batteries are used.