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your best bet for a battery system is to use the same 20 mA for all three LEDs by wiring them in series. They are polarity sensitive but if you get one backwards, no harm done. They just won't work.

The regular headlights are weak in the extreme, you can change them out to warm white LEDs and get much better results


White LEDs run about 3 volts each, the red one in back about 1.5 volts. This makes 7.5 volts total or about half of your battery voltage. You'll need to drop the other 7 volts in a 330 to 390 ohm resistor, 0.25 watt resistor will work fine.

I wrote and LED primer, maybe or maybe not the one you were looking for

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