How Long Does 9v Battery Last Arduino. You could also wire 2 or 3 batteries up to get a much longer battery life time. It can last for about 4 months on 2 AA batteries so it is definetly possible to have low power and remain in the Arduino ecosystem.
If you are using the LEDs a fair bit you can probably ignore the power the arduino is using. A battery clip is soldered to a 21mm barrel connector centre positive. The first problem is how to reduce that 9V to 5V that the Arduino board can use.
Now lets find a datasheet for 9V battery.
You could also wire 2 or 3 batteries up to get a much longer battery life time. Most Arduino boards have an external voltage input and a range of 7-12V is recommended. Answer 1 of 2. An Arduino Uno 122 K ohm resistor 3 100.
