So, i am about to buy a brushless motor a ESC and a 18650 batteries for my arduino.

The batteries "specs" is 3.7v and 20a, if i would to put 2 and more in parallel would i get 7.4v 20a or 7.4v 40a?


  • 2
    This has nothing to do with Arduino. – gre_gor May 18 '18 at 15:55
  • where would i then post it? – Bit May 18 '18 at 15:56
  • The electronics stackexchange. Also what is that battery specification? 3.7V is the loaded battery voltage, but 20A? Maximum continuously deliverable current? – Maximilian Gerhardt May 18 '18 at 17:11

In parallel you'd get 3.7V 40A

What I think you mean is in series. That way you get 7.4V 20A.

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Series connection of battery adds voltage not current but parallel connection keeps the voltage same. Current may be increased with some condition. One things should be remembered 20 a current is huge it is not required by arduino. May be for some welding device it needs that current which can be controlled by high current mosfet

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