I'm very new to Arduino and everything related but I'm highly interested to learn more. However, I've run into a problem right in the beginning.
I want to build some sort of portable emergency/notification button. One pushes the button and an SMS is sent or an HTTP call made to a server. I want to base this project on the Arduino Nano as it's quite small and therefore easily transportable. To have GSM/GPRS connectivity I found the SIM800L which seems quite suitable to what I have in mind. Now to the big question, how to power the Arduino Nano as well as the SIM800L on an portable power source, preferrably only one power source. From my understanding, the SIM800L requires a peak current of 2A when doing handshakes and sending signals. Is there any way I can power the SIM800L through the Arduino Nano, like Battery -> Arduino Nano -> SIM800L, or do I need to connect both the Arduino Nano and the SIM800L to the battery? Regarding the lifespan, for now it would be sufficient if I could press the button a few times and afterwards it'd stop working.