Originally Posted by esprout
Correct, 2.4V over 189.21 hours averaging to 12.7 mV/hour self discharge in that period.
That period actually starts at 2,255.08 hours with 163.2V right after parking the car. So 4.2V over 212.75 hours is 19.7 mV/hour. But voltage drops fastest right after parking the next 12-24 hours.
Drove the car this evening over some hills. It negative recal once up a longer hill as expected as one or more tap voltages drop out. But no CEL/IMA, so performance has not degraded in 9 days storage.
The maximum charge voltage observed is 185V, 4V less than 189V I've observed on my friend's Insight. I may need to dig up an appropriate power supply for the fan and hook it up so I do a full balancing grid charge and see if that top balances the cells, and enables higher peak charge voltage.
Thanks for the clarification. Your bolded statement is not correct. A recal is an indication of a problem with battery imbalance due to the taps dropping out as you correctly note. A tap dropping out after 9 days is likely due to excessive SD that manifests itself under load and doesn't register at rest.
In short a recal after a 9 day sit is because it sat for 9 days, and there is some underlying issue. I have let our '05 G1 sit for 6 weeks. It did not recal. It has a 2 year old "new" Honda battery (bought that way).
You have a tendency to cherry pick your data when drawing conclusions, i.e., "I did these 7 things to the pack, and it's clearly this 1 that did it even though the first thing I documented contradicts it, and I'm willing to point to this one thing and say that's it."
The 22 day deep discharge may have been effective, but you don't have isolated data/results to compare, and your initial flattening of the battery pack with subsequent crappy SD response suggests more may be necessary than just a deep discharge.
What you have now is a documented process and a relatively well known state of the battery - significantly improved from day zero. Take it up a notch. See if the well-followed reconditioning process improves the pack further. Conduct the cycles, drive the car around for a few days, let it sit for 9, record data, see if anything changes, take it for the same drive and see if it recals.