Hybrids

I had the idea of combing a supercapacitor and a normal battery together. My original argument was that the it's hard to absorb all the energy in braking and deliver all the energy for good acceleration from a normal (lead-acid or NiMH) battery. 

This is why (I believe) that they have combined petrol/electric engines ( think electric turbo charge). Rather than have a tiny petrol motor power a battery which drives a electric motor which powers the wheels completely. 

The super-capacitor would help absorb and delver the big bursts of powers and then trickle the power into the battery. 

Next time I'll write the idea down.