[SIZE=3][FONT=Calibri]According to Aviation Week dated 21 January 2013 the functions of the two batteries are:
>>
Fwd (Main) Battery: >>
(1) Provides power for aircraft startup >>
(2) Ground operations such as refueling and towing >>
(3) It can also assist the second battery located aft in starting up the APU >>
(4) And in the event of a power failure it energizes essential flight instruments until the drop down ram air turbine spools up. >>
>>
Aft Battery: >>
(1) Electrically start the APU when neither of the engines is running and the aircraft is not connected to external ground power. >>
(2) It also powers navigation lights during battery only towing operations.
I'm sure these functions will be verified or updated in upcoming NTSB reports. >>
Fwd (Main) Battery:
(1) Provides power for aircraft startup
(2) Ground operations such as refueling and towing
(3) It can also assist the second battery located aft in starting up the APU
(4) And in the event of a power failure it energizes essential flight instruments until the drop down ram air turbine spools up.
Aft Battery:
(1) Electrically start the APU when neither of the engines is running and the aircraft is not connected to external ground power.
(2) It also powers navigation lights during battery only towing operations.
I'm sure these functions will be verified or updated in upcoming NTSB reports.
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