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Old 9th Sep 2013, 13:15
  #29 (permalink)  
misd-agin
 
Join Date: Jan 2006
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Non ER battery will give you "approximately 30 minutes"(QRH) of power.

In the AA SEA-ORD event it lasted 97(?) minutes.

NTSB issues report on AA jet that lost battery power | Airline Biz Blog
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