Are there any accepted figures on the life expectancy of the components we use? I appreciate there are indicators which infer a loss of efficiency, but if you wanted to ensure your craft was always healthy, then you wouldn't want to wait to see the indicators.
Interesting approx using 4 batteries. Is 100 amps not well within the capabilities of most 10,000 mah batteries?
Just out of interest, what are you using to measure the inflight ampage?