Quote:
Originally posted by neo_m
I was thinking if you had a Led that ran on more than 1.2v so that when you hit the boost button it gets the extra voltage from both batts and turns on... if you get what i mean. not the ideal way, I need more to learn more about electronics i think 
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That's a great idea!
Because you're using an LED, it will simply block the current when reversing, so it won't interfere with ops of the car.
This is one that's easily tested too.