Hi,
Pub User and TURIN:
...but I'm not sure any other technology could produce the peak current required of the 787 battery when starting the APU.
No problem!
A Ni-Cad battery of similar size and weight is capable of starting a heavier APU for the 777.
For MAIN the issue is a little bit more "complex". The diode module (certainly) would be removed and there will be new algorithms in the retrofit.
Bearing in mind that Boeing removed the original access door from the forward hold to the forward electrical bay and replaced it with a fixed panel just to save weight gives you an idea of how weight critical they are.
Better to compensate airliners (PAX number) than prolonged grounding.
If the Li-Ion Battery is half the equivelant weight or more of a Ni-Cad
I will post ASAP a detailed comparison to Ni Cd. I estimate the same figure.
Certainly Boeing is working considering ALTN solution(s). ABSOLUTELY FEASIBLE