ES 750 (BE750G) estimated power is much lower than APC runtime estimates

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I have 3 ES 750 (BE750G), each with new or almost new batteries.

For 2 units, I get the about the same estimated runtimes of about 41 or 42 minutes for 45W. The APC

predicted runtime (as per https://www.apc.com/us/en/product/BE750G/apc-backups-es-750va-120vac/) is about 101 minutes.

For the third unit, it's even lower, not even 10 minutes. For this unit, I have run the manual calibration procedure twice. Originally it gave me either <1min or -- min. After I ran the calibration the second time it went to about 7 minutes. So, there is still something weird about this one. And, in case you are wondering, it has a genuine APC battery - I just changed it.

Why are PowerChute numbers so much lower than the APC predicted runtime numbers?

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