I totally understand, no problem here with your follow-up questions...Please understand I'm not trying to be argumentative, but rather just contributing to the knowledge base.
There would be an imbalance, but the imbalance itself is not what triggers the code - rather, most often it would be a cell being truly empty when the rest are well-charged, near '75%'.I'm not sure what you mean about "pre-mature empty or full signals". Wouldn't this imply an imbalance, if it's at the tap level?
In your case, with a P1449, probably a P1449-78, it'd go like this: at least 1 cell is nearing empty, that cell's voltage slope is tanking fast, the BCM measures that slope and sees that a cell is empty - so it considers the whole pack empty. It does a 'neg recal' (BAT gauge plummets to bottom). It then starts a forced-charge - but since the other cells are near full, the BCM can only charge the pack a small amount before those taps reach the 'full' (75%) threshold/voltage. If it can't charge more than 10% of the nominal capacity (10% of 6500mAh) you get that P1449-78 (I've actually seen closer to 20%, where the charge was near 20% and I still got the code)...
So I guess you can look at this either way - as 'pre-mature empty' or as 'pre-mature full'. It's "premature" because normally you'd want and expect all cells to be empty and full at about the same time, so you can use the full capacity range.
You can operate that pack 'forever' with say a tap voltage imbalance up to perhaps 1.2V, but it will only cause a problem, the car will only throw a code, when that voltage imbalance reflects a truly capacity-imbalanced pack of stick-pairs - which can only happen when at least one cell is found to be truly empty... Or the other extreme cases I mentioned...
I just realized one tricky point: realizing there's a difference, a distinction, between capacity imbalance and voltage imbalance. Pretty major tap voltage imbalances are fine*; it's only when voltage imbalance reflects a major major capacity imbalance that the car raises a fuss.
* "fine" in terms of not causing the car to throw codes and the like. Very small voltage variations can reflect major imbalance. A single cell can be near empty, say 1.25V at rest, while all the others are say 75% charged, each with a voltage of around 1.35V. The tap with a near empty cell will have a voltage only 0.1V lower than the other taps - yet the pack as a whole will have problems, barely functional, throw a P1449-78...
I'm not aware of that dictum... Plus, it contradicts what Honda says in some of the troubleshooting sheets. For example, here's an excerpt from the P1568-66 code (emphasis added): "The high voltage side resistance of the voltage sensor is divided into two (2 MΩ and 1 MΩ) to measure the voltage that is divided at adjacent channels (individual voltage) when the circuit is open. If the combination of batteries is normal, the voltage hardly varies (about 1 V at the maximum)."Honda says an imbalance of 0.61v should throw a code, but while observing the cell taps as I drive, I never see that much of an imbalance.
So here Honda says up to 1V max variation is "normal."