This has always irritated me, so here goes. There is no reason a heavy battery would need to charge up to 550 units of energy to perform the same task as a free battery. Perhaps it could go a little more like this:

Standard jump- 75 units
WH jump- 250 units

This way being forced to turn and fight at a WH with unaligned NPCs while your heavy battery charges would not have to happen.

Not too bad of an idea. I always wanted to see a ship-based jump energy requirement, though. Older or larger ships like the behemoth or prometheus would take larger amounts of energy to jumps, whereas a bus or cent would take less. And you could buy little gadgets for your ship that would lessen that requirement (upgraded behemoth jump engine)... or you could even get some add-on that would do something cool, but increase that energy requirement.

http://vendetta-online.com/x/msgboard/2/1894
http://vendetta-online.com/x/msgboard/3/11298

There are several others too, but I'm too lazy to go look for them

The search feature is your friend.