Originally Posted by
alasdair_m
Also, what is the difference between Li-Ion batteries for cameras and phones etc, and "fuel cell systems" also for cameras etc which are not allowed in checked baggage?
Size. The big industrial-strength batts for professional vidcams and similar devices are what are restricted. They've had a nasty habit of occasionally bursting into flames in cargo holds, and the bigger the batt, the bigger the hazard.