TURIN
The ACE (Actuator Control Electronics) backup Batteries are also Li-Ion. Much smaller than a main battery and only designed to last about ten minutes. As far as I know there have been no reported problems with these, even the one that got charred by the APU battery at Boston.
The ACE is single purpose, a true 'Backup', not integrated into the distribution system for general purpose.
If only the APU/MAIN had similar function....
This 'large format' (scaled up) battery as used in the Dreamliner suggests that LiIon is suited to standby power only...
@HighWind... I think the Yuasa program shows challenges to materials/methods as regards spontaneous failure.....also. The pastes, but especially the oxide, must be scrupulously blended, (powder/binder) without imperfection of powdery occlusions, or viscosity variation. Add to that the loss of symmetry of the roll in service, and.....poor performance.
