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Depends. There's cheap battery lights and there's cheap dynamo lights. If you've killed a light or killed a wheel then that's a good time to think about going the dynamo route. It's a pain if you want to swap out a perfectly functional wheel and light combo with dynamo stuff.
Actually can some bored nerd do the maths on how many miles you'd need to ride with dynamo lights to offset the electricity used to charge battery lights? I'm guess a lot.
Wowzers, Dynamo hubs/lights aren't cheap are they.
Looks like I'm going to be charging by USB for a while!