I basically just connected my battery to the converter for testing on a bread board, just to see if it produces the expected result. It's just the battery and the converter, it is not connected to anything else. The lipo is 150mAh.
@Grumpy_Mike , I am not ignoring the advice given, @TomGeorge asked what battery I am using and what my setup is so I was just answering his question. I do appreciate your input but please read the thread carefully before posting snarky comments.
In addition to trying a different, known good source, also try a 1k resistor across the output of the converter. It's a bit of a long shot these days, but back in the old days you had these regulators that wouldn't power up well without a load.
I'm surprized it can work (actually boost) from 0.2V. But clearly the cell is either dead or in protect mode (presumably from overcurrent?) Perhaps its oscillating between periods of working and periods of protect mode - that would explain the output voltage being that high, and the 0.2V on the input is a time average.