Originally Posted by Spooky 2
In addition to the batteries in question there are two other batteries for standby power of the flight controls. No one seems to question these?
And the A380 has used Li-Ion onboard (a source says for emergency lighting) from the beginning and thus had a special condition issued during certification.
A380 special condition Federal Register entry
Also, the widely publicized A350 retreat from Li-ion for main battery use was plausibly described by them as a means to reduce risk--but the risk in question was that of delay in certification, not of hazard to the aircraft in service. As recently as October 21, 2013
Bloomberg carried a story asserting that Airbus said they planed to seek, obtain certfication for, and use Li-Ion after A350 service entry. Presumably they want back the weight loss of the late reversion to Ni-Cd, though in real life Ni-Cd has some other nasty properties besides the extra weight.
Possibly other aircraft besides the A380 use Li-Ion batteries in secondary systems?