Is it safe to use a 11.1V 1300mAh LiPo Battery designed for RC cars/planes with my new Arduino Nano? I read that the Nano can operate on 6-20V with 7-12V being recommended, so it sounds to me like it would be fine?
Also, I know I plug the positive lead into VIN (pin 30) so do I plug the negative lead into GND?
It's been a while since I've done any electronics tinkering, please excuse my noobiness.
It would be more ideal to use a 2 cell battery (7.4 volts). But, your 3 cell battery would also work. For almost all of my battery-powered projects I use a 2 cell LiPo battery. However, if you plan on running something for a long time that could result in total drainage you should consider monitoring the battery voltage and when tripped it goes into low power mode (watchdog timer) and triggers an alarm. You'll kill your LiPo battery if you drain it to 0 volts, or even 9 volts in your case. Use a resistor-based voltage divider and the internal 1.1 volt reference of the Arduino to measure your battery voltage.