787 Batteries and Chargers - Part 1

[RR_NDB]

Overload

saptzae:

Generally, Li based cell chemistries will tolerate transient overload less than others...Important to all batteries is that the cells match, by effective inner resistance, throughout the event. Gross mismatch could even reverse a weak cell. The result would be rapid cell deterioration or outright destruction...A partial cell failure, resulting in capacity loss or effective inner resistance increase, could trigger this scenario.

Question:

The ANA main batt. geometry mismatch was likely due what kind of abuse? During charging cycles?

(BOS incident had APU start then charging) JAL APU battery had CT possibility?