If you decide you need more power than any of these dynamos or batteries provide, you can get more than one. It might be extreme, but it certainly is possible to run a hub dynamo and a bottle dynamo at the same time. In fact, you could probably install four bottle dynamos on a bike. Pedaling would be hard, but you'd be making a fair bit of power.

It's a bit like calorie counting for controlling your weight. Your fuel burning needs to balance your food consumption if you want to keep your weight.