I like pipes but something more sleek for carrying or in a pipe maybe nice for driving,it would need to be an automatic for me.
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Could one build an APV out of a 2S A123 18650 pack?They drop to 6.0 volts with a load and stays there for 75% of discharge.Our servos like 6.0volts so they work very good.They only stay ay 6.6 for the 1st 3-5% of discharge curve and you can abuse them greatly they always bounce back.