After much investigation I have come to the conclusion that lithium rechargeable battery's are the battery of choice. They are the best value for money in terms of power to weight ratio. I have to keep the bike somewhere in the original weight range to get it registered, and i also want the bike to have as great a range as possible with the latest technology available. I am looking a making a battery pack consisting of 40 3.2V 40A lithium battery's that weight about 1.5kg each. So that gives me a total battery pack with a nominal voltage of 128V at 40A and a weight of 60kg. This works out to be a ~5kw battery pack. So it should run the 3kw motor for at least 1.5 hours.
I am going to make 40 fake batteries of the same dimensions that i am looking at using to make sure i can physically fit them in the bike. I have the leftover room where the electric motor is and petrol motor was, i also have some room up front near the headlight that I may be able to squeeze a few in and also where the air-cleaner was and of course under the seat where the petrol tank used to be. I also have to be careful to leave enough room for the battery charger and motor inverter.
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