Yes, that 5V boost converter will not be as efficient as you are hoping, I suspect. Your schematic labels it as 13uA quiescent current, but I imagine that is when it is disabled and not producing 5V output. The quiescent current when it is producing 5V will be nearer 100x as much, I suspect. I hope I am wrong about this, so please post a link to its specs, because if it is as efficient as you hope, I want some of those too!
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