On assumptions
Hi,
New batteries:
1) Maintenance free: Dozens had to be replaced prematurely
2) High MTBF: Dozens failed and 2 grounded the fleet in ~ 100,000 hours
3) Heat (cell) is not an issue: Thermal runaway created smoke and fire.
4) Safe to be located in EE bays:
In one case Logan firecrews
spent more than one hour
to control a fire. In TAK the
smoke was visible by ATC. A
non designed fuse (ground
wire) opened and probably
saved the day. (With the
prompt landing.)
5) Algorithms are capable even
to "avoid" individual cell
temperature monitoring
probes: A shorted cell
triggered a thermal
runaway. (BOS) A super
heated cell (# 3) led to a
short circuit of 12 V to
battery case as mentioned
(model) in an earlier post.
Other assumptions were made...