I am powering a SIM800C from a 3.7V Li-ion battery. If the battery charge drop below 85% (it still has 4.1V measured without load), the module keeps restarting during startup. This probably happens because of a high load (up to 2A) that causes a voltage drop. According to the SIM800C manual, this could be avoided by using capacitors. I have tried to interpret the reference circuit from Simcom and I use the recommended capacitors but this does not help. Am I connecting the capacitors the right way?
This is the reference circuit from the SIM800C manual:
And this is how I have made the connections:
CA is a 100uF tantalum capacitor and CB is a 10 uF ceramics capacitor.