re leonardo's point about the Bosch battery 'in a bag'
I read that Tony Castles (He of the Nano motor) uses a 2 Ah battery directly mounted on the luggage block of the Brompton. From the pictures it looks like the Bosch powertool battery which is 36v and 2 Ah. The standard way of carrying the Nano-Brompton battery is in one of the variety of Brompton bags that mount on the front luggage block.
I was thinking of using the small Brompton luggage frame, cutting off most of the frame and mounting the DeWalt battery in the bottom half of a DeWalt power tool (bulk of the powertool removed) permanently fixed to the frame. The frame then connects to the terminals on the luggage block when it is fitted and disconnects when you lift the bag off.
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