The above-posted NTSB recommendation were derived from the investigation of in-flight fire and crash of Asiana Airlines Flight 991 on July 28, 2011.
In that case the B747-400F cargo hold contained two pallets of lithium ion batteries to power an electric car.
There were 18 li-ion batteries -- each 571 pounds (259 kg). Intermixed with the li-ion batteries on the same pallets were flammable liquids.
Each of those batteries is approximately the weight used in a Nissan Leaf electric vehicle.
The actual ignition source was never determined.
If cargo planes are going to carry around mixed pallets of li-ion electric vehicle batteries and flammable liquids, I guess some additional rules or guidelines might be useful.
I hope I am not restricted from taking some spare camera batteries because of this.