Hi guys!
I am working on a project, which includes an Arduino and Sim800L module.
I am having questions about the way of powering things up.
I thought of using a 18650 battery, which can provide sufficient voltage and peak current for SIM800L (3.4V - 4.4V, 2A peak).
I want to charge this battery with USB cable(5V) using this module(TP4056 ).
It says Battery overcurrent protection current: 3A- so does it mean it can output maximum 3A current?
Also, i am using an Arduino Nano which is a 5v opearting voltage module, so this 18650 wouldnt be enough right? 
Can you link me a module with i can use the 18650 to power up the arduino?
Or if you have any better idea for the power supply, could you share it with me?
Safety: overcharge, overdischarge, short-circuit protection is important, and also it must output at least 2A.
Thanks for your help in advance 