Hi,
SoS, Duty cycle indeed is important to be considered in the analysis. And APU vs MAIN (batteries) failure comparison.
I commented on another possible 787 System "use" of the Thales battery in B/C thread.
Lyman, bleed scheme change in 787 created new dependability requirements to a degraded configuration. But as i imagine the POB are not relying on the Li Ion battery.
As i understand RAT and MAIN are for other less critical uses.
Or not?