I got a Cannondale Treadwell Neo Remixte and want to use a range extender battery on it. It uses the Mahle ebikemotion hub drive. The problem is that when I mount the range extender battery on the seat tube it is a few inches too far away from the charging port for the internal battery. Communications with Mahle and Cannondale have been amazingly frustrating and unproductive--each placing responsibility on the other and basically saying we don't have an extension so tough. I am a bit hesitant to just cut the battery to battery cord on the extender but wondering if I could do that and just add some length to the cord. (reasonably competent at wiring/soldering). Any suggestions? The availability of the extender was a consideration in our purchase and quite disappointed that neither of the companies has any interest in making it work on that frame.