Would you check please if pin 1 is a positive and 3 negative?
I received this information today from a German site http://www.powerbutler.de/Ladegeraete-und-Adapter/powerbutler-E-Bike-Akku-Bosch-Multi-Charger-Ortler-Staiger-Winora-Zemo.html , but I don`t understand how that is possible...