Motor shield extnal power supply

What is the max voltage for external power supply 4 l293d v2 motor shield. what the best type of battery to use to power 4 DC motor and servo. 18650 3.7 v battery wires in series and parallel?

The supply range for the L293D is 4.5 to 36 volts. The best battery is one that supplies the required voltage and current as required by your motors. Since you havent supplied any information for those motors, that leaves us unable to help with your question.

tstack1986:
What is the max voltage for external power supply 4 l293d v2 motor shield.

L293D chips are only used on the old/inefficient V1 of that shield.

Max motor voltage on that shield is the max voltage rating of the supply caps, which is 16volt.
4*4.2volt = 16.8volt might be too much.

Which motors.
The limiting factor will likely be the L293 chips, not the battery.
Leo..

yea i think it was like 4 18650 batty and light bolt jump out of the first one or maybe it was its soul. it didnt work after that