> A laptop with a fully charged battery can cause a lot more havoc over the Atlantic ocean than one with the drained battery. Presumably you could bring in a co

> A laptop with a fully charged battery can cause a lot more havoc over the Atlantic ocean than one with the drained battery. Presumably you could bring in a couple of extra batteries as well, because it's going to be a long flight. I have an external battery for my X220 which I use on long flights. Just out of curiosity I calculated the equivalent energy in TNT which the batteries hold. It was about 220g. And Li-ion are known for their explosive discharge.