Using arduino nano and SIM800L with a battery

Other Hardware General Electronics
1

Hi, I am completely new to the world of electronics.

The project I am working on is a portable emergency button. When the user presses the button and turns on the device, it sends a sms for help.

I am planning to do this with an arduino nano, a SIM800L and a battery.
The arduino will be off until the button is pressed, so the device will not be constantly consuming power.

Since the arduino starts running code whenever it is turned on, my only question is about the V and mAh.

What kind of batteries and capacitors/resistance do I need?
What pins should the battery be connected to?

Link to SIM800L datasheet: http://img.filipeflop.com/files/download/Datasheet_SIM800L.pdf

Thank you so much in advance.

2

You can power the whole think with a couple of AA batteries using the 5V pin of the arduino.

3

?? What sort of aa cell? Standard AAs are 1.5v, 2 X 1.5 = 3v.

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