I'm trying to use a boost converter from Pololu that steps up my 1.25 input voltage from a AAA battery to 5V in order to power an Arduino. I have found that my Arduino needs .03A to be powered.
I understand that if the boost converter were 100% efficient and when using
(V*I)in = (V*I)out, I would need .12A to be drawn from my AAA battery into the boost converter. However, when measuring the current drawn directly from the battery using a multimeter, I find that 1.05A is leaving my battery and entering the boost converter, while .03A is leaving the boost converter and entering the Arduino. This implies that my boost converter is about 11% efficient. The voltage seems to be stepped up fine from 1.25V to 5V.
This efficiency is concerning since the Polulu component has an input current limit of 1.2A, and I also need to drive a small motor. I am wiring the positive and negative terminals of my AAA battery to "Vin" and "GRD" on the boost converter respectively, and then wiring the "Vout" and "GRD" pins to the "5V" and "GRD" pins respectively on my Arduino. I am not using the "SHDN" pin.
So, am I wiring the boost converter incorrectly, or is this efficiency typical?