It's a bad trade off in my opinion. With battery mounted the way it is, handling is way better. I don't want a wobbly bike in exchange of some stealthynessYep, I agree with many of the ideas so far, the top box, the bulky battery pack, and the exposed large hub motor are what makes it look less like a bike.
I think you'd need to lose the top box and lower the panniers so that they hide the large hub, and fit the batteries in them.
The weight distribution wouldn't be as good as you have it now, but it would look a lot less "motorised"...
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That is actually my main concern. I always try to pedal but sometime I'm lazy...It's not what people say is important. I'm a little worried that from behind with the topbox, it looks like a scooter without a number plate, especially when it out-drags all the other bikes away from the lights. I hope you pedal all the time, Cwah.
I have got a box like that though beware the lock is rubbish fine for storing a D lock but would not leave anything valuable in it.Maybe this top box look less motorbiky?
http://www.amazon.co.uk/M-Wave-Amsterdam-Box-Cargo-Topcase/dp/B001EVAYFK/ref=sr_1_24?ie=UTF8&qid=1441758048&sr=8-24&keywords=top+box