Don't put battery fires out?
I'll leave it to you pilot types to cover the "Pilot Stuff" while I'm turning the spanners !
However, from the PDF someone posted a page or two ago regarding aircraft fire systems,
Page 17-2
Class D—fires involving combustible metals, such as magnesium, titanium, zirconium, sodium, lithium, and potassium.
And from Page 17-10
However, do not use Halons on a class D fire. Halon agents may react vigorously with the burning metal.
Anyone got a chemist friend who could comment on what "vigorously" might mean in this event?
What would happen if a small or otherwise controllable lithium-battery fire occurred and the pilot discharged the Halon extinguishing system on it?