Koga E-Tour: traveling with extra comfort With the E-Tour, Koga has achieved a fusion of two battery concepts so as to offer an e-bike, which can address a huge variety of applications and user expectations. So for the 2012 model, the battery is concealed within the down tube, but unlike on the E-Advance, it can be removed for charging. The advantages are clear: a parking place with a power socket is no longer needed, and in comparison to e-bikes with the battery pack on the rear carrier rack the visual effect is noticeably cleaner – and not least, more discreet. The center of gravity is also better.