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First, according to the securaplane website, battery history is recorded by the chargers - not the BMS co-located with the battery cells.
I had a look at the securaplane website few days ago and couldn't find any detailed info re: where the logging is done. This may depend on particular system requirements. Can you post a link to the relevant page for the actual 787 charger system ?.
The 3rd paragraph, just above the images, on this page:
Innovative Inverter Technologies and Main Ship Battery Chargers for Power Conversion
Securaplane battery chargers store every fault including battery over-temperature, cell unbalance, defective temperature sensors, defective charger/battery connection and GMT time/date of fault period. Our chargers possess extensive diagnostics such as charger microprocessor status and permanent memory of faults with readout to the integrated 8-character alphanumeric display.
It also mentions it in their product brochures.
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It's worth noting that this, too, apparently worked as advertised as there
was a "drop to near zero" recorded on the batt of the ANA aircraft.
Sorry, but a drop where ?. The associated dc bus, in the fdr, or what ?.
Neither article was that specific, but both IIRC mentioned the battery dropping to "near zero voltage."
Sorry,
it's not about logging.
It's about controlling/charging.
What? The circuits in the battery box? Finding the problem?