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I have not, but would be interested in how they compare. Specifically, I like to measure cost, and not just for one battery. That's because batteries are different, so cost per battery comparisons still amount to comparing apples and oranges.
So I figure out kilowatts-hours (energy) one battery delivers from full charge to "empty" (proper discharge level, not run down to 0 volts).
I also assume the battery will need replacement at the end of the warranty period. That's far from perfect, I know, but two things are important about that assumption: battery manufacturers generally lie about the same (AFAIK), and batteries surely don't last forever. (NiFe would likely last past my "expiration date", life expectancy, but I still do that math).
My measure, then, is dollars/KWH/year. I wish all battery manufacturers would advertise their batteries with my measure, for easy comparison.
Peter
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