[macksd]

As others have mentioned, the energy density is a big deal because those planes' fuel accounts for A LOT of their take-off weight. To both illustrate this and point out another potential problem: when a fully fueled heavy, long-haul / high-capacity airliner needs to make an emergency landing shortly after take-off, one of the first things they do is start dumping fuel to reduce the weight (make it more maneuverable) and reduce the fire risk of a crash. Not sure what a comparable procedure for batteries might look like.

[FabHK]

An A380 at MTOM has about 15% payload (pax, cargo) and about 40% airplane, so a full 45% fuel. And kerosene has about 30 to 90x the specific energy (energy per mass) as current batteries, so for an electric airplane the numbers would be much worse. (Plus the Airbus doesn't have to carry the fuel it has burned, while an electric plane does have to carry the empty batteries.)

TLDR: Long range air travel with batteries is a long time off.