Just less troublesome, because you always had to use a battery to take the energy out then remove it.
Also, it will heavily encourage people to use IC² miners, as people used BC quarries with TE energy cells.
Moving power shouldn't be super convenient in my opinion though.
Maybe loose a small percentage of the power when the block is picked up in exchange for being able to carry a large quantity at once instead of using battery items?
(If you want to transport large quantities losslessly there's Railcraft's energy carts, or gregs wireless option of course)