I remember fun days working in a lab where colleagues were developing
the "revolutionary" sodium sulfur battery (colloquially referred to as
the "fire and brimstone" battery). The chief skill developers learned
was how to run fast while wearing asbestos suits and full-face
protective helmets. If you've never had to deal with a bucket of
burning molten sodium, you've never lived! (Hint - water isn't
terribly useful!) You probably wouldn't want any quantity of burning
(molten or otherwise) lithium near you or in your glider either.

Lithium is WAY too close to the reactive end of the periodic table
(right up there with sodium, magnesium and potassium).

MIke