I am developing a Kit with GSM module which have to receive and send commands. I have gone through many GSM modules(SIM900). All of them consume around 1.5A at burst time. So I am in trouble to develop a power efficient Kit.
My doubt is normally mobile phone battery has the capability of 1000mAh. According to the calculation it has to work around 1 (busy) hour. But normally they stands for 1 day at-least. Are mobile phones uses any low power GSM modules? Is there any specific sleep-wake up mechanism with them?
Your suggestions and helps around this topic is appreciated.