I would hope the NTSB and/or the TSA can come up with specifications for cases that would allow these batteries to be transported safely rather than waste time calculating metallic lithium equivalents.
Perhaps Nomex-lined, baffle-vented steel cases that can contain a small lithium fire. Keep the batteries from shorting and, if one should go off, prevent them from igniting anything nearby.
If it’s possible for hunters to transport ammo, why can’t professional camera crews transport batteries?
Lithium batteries aren’t inherently dangerous. It depends on the design. For example, A123 Systems batteries, like the ones found in DeWalt power tools, can be drilled and not explode.
One would hope that the TSA can come up with a solution, but it’s not likely anything will change in the near future. Also regarding the power tool batteries and explosion. From what I’ve read, explosion is not the problem it’s the high temperatures in a lithium fire that causes the concern.