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We got GSM Module 900a without a port so we decided to give it power using batteries. But we came to know that we would have to make a battery of 5V 2A to handle it properly and using directly from the arduino may result damaging in the long run as we interface other components on the Arduino current goes down. Anyone who knows correct way to make the battery or connect. We don't want to use adapter and make the system portable..

It is evident that the Arduino cannot deliver 2A. But an Arduino GPIO pin can turn on a transistor (BJT or MOSFET) which, in turn, will be able to switch on or off the circuit.

Please, supply more details about how an Arduino becomes involved, otherwise, it is way too much general, as stated.

We are making a fire alarm and extinguisher system using arduino, so we are controling other components like sensors , buzzer etc from arduino. So we can't use arduino to power GSM module as it would not be able to fulfill 2A requirement for GSM module. I want to know how to create a battery suitable to power GSM module 900A. According to our research till now we got to know that 5V 2A battery would work. But we don't know the best way to create that battery.

@Doodle Baseball, Do you have a complete diagram of the circuit you are using?

@homebelted How about a power bank? I think you can use a compact, high-quality power bank (many modern ones provide stable 5V 2A) and connect it directly to this code and its GSM module's VCC and GND.

Yes, but our module has no port, though it has two power wires. Should we remove the protective layer and then connect it?