Has anyone tried to connect a second main battery to the charge port - or more specifically, gotten it to work? I am running out of battery sooner than I'd like with main battery + range extender on my KSL. The bike is close to ideal for me if I can get a longer run time (without having to carry an additional RE). There is plenty of room to fit the relatively small main battery on top of my down tube. I can 3DP a mount to secure it if I can get it working. I tried plugging in a second main battery with the RE cable and the bike wouldn't turn on. I assume the BMS is programmed to recognize a RE but not another main pack. Wondering if there is any way around this.